If someone wants the S7 international version, the correct model is G935F.
Aside from availability, why would anyone not want to buy the dual SIM instead, G935FD? Are there any downsides to the dual SIM vs the single SIM?
No difference if you do not use 2nd sim, if you use 2nd sim then cell activity will increase obviously and risk of higher battery drain when there are poor signal strength
Not sure if your ROM modding options may also be more limited if you wish to keep 2nd sim fuctionality
I just bought one and can't figure out how to get Samsung Pay to work. The stub app is there but it always fails to download. :/ (And on Play Store, says your device is incompatible with this version.)
Other than that, I can't think of any other downsides. But I do wish Samsung Pay worked...
Melamunna said:
I just bought one and can't figure out how to get Samsung Pay to work. The stub app is there but it always fails to download. :/ (And on Play Store, says your device is incompatible with this version.)
Other than that, I can't think of any other downsides. But I do wish Samsung Pay worked...
Click to expand...
Click to collapse
Samsung Pay is available only if Samsung has it officially released on your country. Or else it will show as incompatible (happens to my S6 edge)
I have one... so far so good using 1 SIM
DUOS written on the back
Sent from my SM-G935F using Tapatalk
Be aware the second sim uses the SD slot, so you can't have an SD card if you use both sims.
No downsides so far using the 2-sim model. Actually I followed a video tutorial on Youtube and got the SD card to work with both SIMs (regarding to last post).
My only worry is that maybe we won't get as much ROMs as the single SIM variant.
The main feature difference, at least between the Dual SIM international version (this one came with a lot of chinese written on the cling film phones get shipped with, default language was chinese, and even after selecting, the Dual SIM selectin menu still display still shows a couple of chinese characters) and my single sim international version (I believe it is a ME version as using Samsung info, it showed localisation to Egypt) is that the DUOS version only allows 2G/3G connectivity, there is no 4G or LTE option at all when you go into Network Mode, whereas my single SIM version allows you to choose b.w 2G only, 3G only, 3G/2G (Autoconnect) AND LTE/3G/2G (Auto connect).
I believe only SIM1 allows data, SIM2 is calls only, and its not active standby, i.e. if you're on a call on SIM1, and someone calls SIM2, they'll get a busy tone, no call waiting.
I haven't really noticed any major difference in terms of battery usage
If you're not bothered about 4G or LTE, then the Dual Sim is the way to go. It IS possible, with a bit of DIY to use 2 SIMs AND the SD Card at the same time.
--Yo-- said:
No downsides so far using the 2-sim model. Actually I followed a video tutorial on Youtube and got the SD card to work with both SIMs (regarding to last post).
My only worry is that maybe we won't get as much ROMs as the single SIM variant.
Click to expand...
Click to collapse
Thanks for mentioning that YouTube. I was curious and found one instruction: https://youtu.be/GpRaHpF3cNI. It quite a surgical procedure but doable.
Any 93xF ROM works on the corresponding FD variant.
RizSher said:
I believe only SIM1 allows data, SIM2 is calls only, and its not active standby, i.e. if you're on a call on SIM1, and someone calls SIM2, they'll get a busy tone, no call waiting..
Click to expand...
Click to collapse
SIM 1: 4G
SIM 2: 2G only
That's on the S7 specs page (HK or Chinese site). You could also see the youtube video above. Toward the end it's showing exactly that.
lost_ said:
Thanks for mentioning that YouTube. I was curious and found one instruction: https://youtu.be/GpRaHpF3cNI. It quite a surgical procedure but doable.
Any 93xF ROM works on the corresponding FD variant.
SIM 1: 4G
SIM 2: 2G only
That's on the S7 specs page (HK or Chinese site). You could also see the youtube video above. Toward the end it's showing exactly that.
Click to expand...
Click to collapse
Absolutely incorrect information;
I am using G935FD. Both the sim's are 4G Capable.
Any one 4G Sim is active at a time as it is a technology limitation and not phone.
Also can receive call on both sims simultaneously and there is a special setting for same.
And Yes you can use 2 sims and a SD Card together with some efforts.
RizSher said:
The main feature difference, at least between the Dual SIM international version (this one came with a lot of chinese written on the cling film phones get shipped with, default language was chinese, and even after selecting, the Dual SIM selectin menu still display still shows a couple of chinese characters) and my single sim international version (I believe it is a ME version as using Samsung info, it showed localisation to Egypt) is that the DUOS version only allows 2G/3G connectivity, there is no 4G or LTE option at all when you go into Network Mode, whereas my single SIM version allows you to choose b.w 2G only, 3G only, 3G/2G (Autoconnect) AND LTE/3G/2G (Auto connect).
I believe only SIM1 allows data, SIM2 is calls only, and its not active standby, i.e. if you're on a call on SIM1, and someone calls SIM2, they'll get a busy tone, no call waiting.
I haven't really noticed any major difference in terms of battery usage
If you're not bothered about 4G or LTE, then the Dual Sim is the way to go. It IS possible, with a bit of DIY to use 2 SIMs AND the SD Card at the same time.
Click to expand...
Click to collapse
At first I was going to say that your post is totally false, but then I realized that you have the Chinese/HK SD820 935FD version....
On the Exynos version, contrary to common belief, LTE/4G/3G/2G is ALLOWED on BOTH SIMs..... BUT ONLY 1 CAN HAVE DATA AT A TIME. See attached pics. I've already proven this by using two different SIMs, both with data, in different configurations (1 at a time, both inserted, swapped), and sure enough, SIM2 is capable of DATA.
So SIM2 is NOT JUST CALLS ONLY.
Difference in battery? Don't know really. Haven't been using both SIMs simultaneously enough to make a sound judgement.
The fact that you CAN use DUAL SIM & Micro SD at the same time (with a bit of work), AND have LTE on either SIM, AND be able to root/TWRP/custom ROM - the Exynos 935FD is the way to go....
In the messages app you will see either the sim 1 or sim 2 icon to show which sim you sent the messages with. Thankfully it doesn't show in the status bar
zabaknilesh said:
Absolutely incorrect information;.
Click to expand...
Click to collapse
You meant *partially* incorrect, not absolutely as if everything I said was incorrect.
Glad you can chime in.
Related
As the title says... Mostly I need to know in general if I´d be able to use my 3G sim into a LTE phone. Need to know this because Google is probably releasing a Nexus 4 phone On Google I/O which is said to be TLE enabled and will have 32 gb for storage.
Honestly i only care about the 32 gigs because I live in Costa Rica, Central America and LTE is still not avaiable here, and who knows when will it arrive so I'll stay with my 3G sim card for an undefined time. It's important to mention that plans in my country do not restrict using my sim card on a certain phone, or viceversa, everything is totally unlocked (at least with my phone company) so I can do whatever i want concerning with switching betwween phones and stuff. So, If an LTE phone can read my 3g sim card i'd surely buying this awesome phone. I use A LOT my actual phone for music playback and that's why my focus is on the huge 32 gb storage.
So, again, can I use a 3G sim card on a LTE phone and have access to the normal phone functions (calls, messaging, 3G internet...)??????
I'm asking this because on my research on Internet I found people who say it does is possible and a lot who say it isn't...
Unless it is a CDMA device, a "3G" SIM will work fine, my current SIM card is "3G" (Straight Talk doesn't offer LTE) and the current Nexus 4 is capable of LTE...I'm not having any issues.
Now I've read sometimes older SIMs have issues with newer phones but I haven't had that issue.
so if there's a problem i'd just need to update my old 3g sim for a new one and that shoud work for any phone marketed as LTE or 4g???
Hi all,
I have the dual sim S7 SM-G935FD running the XSP firmware. Rooted with the microSD Mod on Sim 2. It's being used in the USA at the moment. Sim 1 is AT&T and Sim 2 is T-Mobile. Both are USA sim cards. Everything goes through Sim 1 AT&T - Voice, Text and Data. Sim 2 is just for receiving calls only. Sim 1 is set at LTE/3G/2G and Sim 2 is 2G only.
Since day one I have this connectivity issue pertaining to data connection.
When Sim 2 gets a weak signal and eventually drops out, data connection on Sim 1 remains - everything works. However, when Sim 2 is picking up signal again, the data connection on Sim 1 drops out.
When this happens, the pull down notification will display that the data connection is on Sim 2 - as if the phone switches the data connection from Sim 1 to Sim 2 by itself. However, if I go to the Sim Manager, it will show that the data connection is still on Sim 1 like it originally was. At this point, the phone has no data. And yes, the phone is displaying conflicting information. Notification says Data is on Sim 2 but Sim Manager says Data is on Sim 1.
To fix this, I have to use the Sim Manager, select Sim 2 for Data. Wait a few minutes. Then, choose Sim 1 for Data again, then everything comes back normal. Data connects.
This is quite annoying in a poor reception area.
Troubleshooting steps that I have tried but they do not fix the problem-
Flash stock firmware no root
Use a different stock firmware - XEU
2 sim cards only with no microSD card on the back of Sim 2
Choose 3G/2G only for Sim 1 and 2G for Sim 2
Swapping Sim 1 and Sim 2
If I disable Sim 2 the problem goes away, but of course, what's the point of dual sim then?
I also have a S6 Edge+ Duos SM-G9287 but it does not have this problem.
Any ideas? Thanks.
Just wanted to add that I am experiencing this as well.
Man this is getting unbearable. Is there a specific forum for the FD devices? I'm thinking I might just return this phone while I still can.
Wow I was going to put something on boards as well with literally the exact same setup in USA. It gets way annoying when tmobile gets weak and switches even though I have it set on sim 1 data. I really hope there is a fix or else I might make the switch to htc10 (if they even get a dual sim) and keep my fingers crossed it works better. My S6 duos works better than this but I don't have additional memory with hybrid SD sim card on s7.
Sent from my SM-G935F using XDA-Developers mobile app
FYI -
I have been running XSG firmware. I just upgraded from APC8 to APD1 and the problem still remains.
Just trying to save some time for those of you who thinks upgrading will resolve the issue... it will not.
It is amazing how the S6 Edge+ Duos does not have this problem. Things went backwards for Samsung.
No problems here though mine is the G9250 dual sim version (HK).
G9250 is s6 edge is it not? We are on g935FD. It seems like I can never find the elusive perfect dual sim! Always some kind of bug! Might be heading back to my Xperia z5 premium. Can you guys confirm that it's wifi causing it? Seems like whenever I come off of a wifi network it never picks mobile data back up.
That seems like part of the problem too..as soon as wifi loses connection then it switches and then no more data
Sent from my SM-G935F using XDA-Developers mobile app
Has anyone fixed this? I have tried to flash a couple different modem firmwares to no avail. The T-mobile one won't flash as it uses a snapdragon chipset.
Mine was doing fine until I did a firmware update and now the data connection problem appeared. I was on a B6 firmware with a B9 modem on a AFG CSC so I will try to go back to this and report back whether the issue resolves. Any firmware starting D1 (tried D3, D6 and D8) causes the data connection lost issue. Even just going back to a B9 modem with the D8 firmware didn't help. What a pain in the rear...
Follow up to my previous post:
Officially, G935FD is a piece of crap. Tried every combination of modem/AP to get this work but no luck. Resorted to single sim mode for now.
I have this same issue. the only way it works is to manually select one sim in use at a time. I just removed the second sim and added a micro sd card for now.
craigg1 said:
I have this same issue. the only way it works is to manually select one sim in use at a time. I just removed the second sim and added a micro sd card for now.
Click to expand...
Click to collapse
Did you update your firmware to a different CSC? That's when my issues started (went from AFG to BTU and even after going back the problem wasn't fixed)
What is your original CSC?
onurd said:
Did you update your firmware to a different CSC? That's when my issues started (went from AFG to BTU and even after going back the problem wasn't fixed)
What is your original CSC?
Click to expand...
Click to collapse
Mine didn't work out of the box with stock firmware. I have since upgraded the stock firmware but haven't tried using two SIMs with the latest update. Maybe I'll test it over the weekend.
+1 on this bug existing for me since day one. I have been sticking it out and staying with dual sim as I don't have any other option. Kinda wishing I had just returned it... I have gone through hell trying to talk with people in India (where the phone is apparently from) about just getting the bug's existence up the chain. If only we could get a dev to take a look at our logs so I can have a reason to just root the damn thing already. Has anyone tried maybe flashing the sim manager apk from the s6 edge? Is there even a sim manager apk?
I have exact same problem with S6 edge+ dual sims. SM-G9287. Problem started since marshmallow updated. Didn't have this problem before under old android version. Has anybody found any fix yet? Right now, If I disable one of the sim, then it seems ok, but I need both sim to be on to receive call on either number.
My phone was stock firmware. Problem seems to be with Marshmallow 6.0.1 , not because of custom firmware.
vietmax said:
I have exact same problem with S6 edge+ dual sims. SM-G9287. Problem started since marshmallow updated. Didn't have this problem before under old android version. Has anybody found any fix yet? Right now, If I disable one of the sim, then it seems ok, but I need both sim to be on to receive call on either number.
My phone was stock firmware. Problem seems to be with Marshmallow 6.0.1 , not because of custom firmware.
Click to expand...
Click to collapse
Kind of same problem here, but it happens only since I received the update to APD1.
I live on a border zone, so I have to force my LTE sim card to its own network. The second SIM is only on 2G.
When the phone loses its own network, SIM with LTE completely disappears, everything is moved to SIM 2G and of course I lose network. The problem is that the SIM with LTE is not seen anymore, even if I go back where the signal is, and the "mobile networks" option disappears in the Settings. I cannot do anything else the reboot the phone to see the SIM again.
Ciao Marina
I have similar issues with my s7 duos not the edge model. Sim1 tmobile, sim2 at&t. Sim2 seems to be the issue for me. Cell quality at my house is not great. I also have a xperia z5 premium dual that has similar problems mainly with lte. The samsung does hold lte signal but the bars are misleading. But the samsung, I woke up this morning and sim2 was offline no calls or text or data. Call quality with sim2 isnt as good either. I blame cell signal on that since the sony has similar issues. But I have seen it with sim1 set to calls and texts and sim2 for data the pull down says sim1 even though sim manager says sim2 is data. Wtf right? Disabling sim2 and reenabling gets it back working again but what happens when the phone does this is you lose data since sim1 data would be gsm only. The common theme is sim2? Also seems signal quality is a big factor. My CSC code is ECT which is Nigeria. I have not changed firmware yet other than the APD1 update. Ironically my xperia z5 dual didnt have these issues at all with lollipop the problems started with marshmallow. I am in the US by the way.
Temporary fix?
Looks like I accidentally ran into a temporary fix, that's working for me for the last few days. I'm on Vodafone for SIM1 and T-Mobile for SIM2, EU&US.
When I restart the phone and set SIM1 for data on LTE/3G/2G it connects, but looses the connection after a while and defaults to SIM2 (with no data). No BT, no WIFI, no data icon anywhere the screen.
When this happened, I ejected the SIM card holder and pushed it back in 2 seconds. Suddenly SIM1 was trying again to connect and the 4G icon appeared. At his point I turned on WIFI.
The weird stage: WIFI on, 4G icon flashing every 5secs – but it's working as it should. If I loose reception, it does not switch cards. Actually never switches card if I don't want to. I can live with the flashing 4G until we have an official fix.
Let me know if it works for you guys!
Im learning that mine is a lot more stable if I set everything to the same sim and not split up talk/text on sim1 and data only on sim2 like I was doing. Not sure if this is placebo for now but I have everything set to sim2 and so far so good with no drops.
Can I have 1 sim for data & voice running at 4G, while the other sim for voice & sms only in 3G? Or only 2G supported?
Because I read at 1+3 forum that it can actually do this, so I was wondering if the Axon 7 can as well. I don't see why not, correct?
Has anyone tried this? I'm in the US, and would like to be able to run a tmobile mvno sim (4G+voice+sms) + an international sim (voice+sms) that's roaming on AT&T who will shut down 2G soon.
It's a dual 4G sim slot, so yea you can run it like that.
zolo111 said:
Can I have 1 sim for data & voice running at 4G, while the other sim for voice & sms only in 3G? Or only 2G supported?
Because I read at 1+3 forum that it can actually do this, so I was wondering if the Axon 7 can as well. I don't see why not, correct?
Has anyone tried this? I'm in the US, and would like to be able to run a tmobile mvno sim (4G+voice+sms) + an international sim (voice+sms) that's roaming on AT&T who will shut down 2G soon.
Click to expand...
Click to collapse
Go to settings - dual sim settings - network mode and on sim 2 tell it GSM only. It will keep sim 2 on 3g. Also on settings -dual sim settings you can turn off mobile data for either sim. Just put t-mobile in sim 1 and at&t in sim 2, shut off mobile data on sim 2, and tell sim 2 gsm only. Done
Thanks for the info, I didn't buy the device yet; but this makes choosing a device even harder since both can do this now (1+3 & Axon 7).
Until recently this was NOT the norm I believe, best I could find was a dual sim phone with 1 sim @ 4G while the other @ 2G only.
tabletalker7 said:
Go to settings - dual sim settings - network mode and on sim 2 tell it GSM only. It will keep sim 2 on 3g. Also on settings -dual sim settings you can turn off mobile data for either sim. Just put t-mobile in sim 1 and at&t in sim 2, shut off mobile data on sim 2, and tell sim 2 gsm only. Done
Click to expand...
Click to collapse
Doesn't GSM-only mean 2G? While both slots are hooked up for 2G/3G/4G, I think only one slot can be connected to 3G/4G at a time, the other slot goes down to 2G.
When I have my Verizon SIM in Slot1 (chosen as data connection) and a T-Mobile SIM in Slot2, using apps like LTE Discovery show my A7 connected to Verizon LTE, Verizon 1x (2G for voice calls), and T-Mobile GSM (2G), not T-Mobile HSPA (3G). When I switch the data connection source to Slot2, it connects to T-Mobile LTE and Verizon 1x (2G), not Verizon EVDO (3G).
Yes I was able to confirm LTE and WCDMA simultaneous operation
Hi! Amazingly, yeah this works...you can have LTE on one SIM and WCDMA 3G on the other (voice only). I tested this with two T-Mobile SIMs and was kind of shocked as in the past it seems like all dual-SIM phones are limited to GSM-only on one of the two SIMs, as has been mentioned above...
But...strangely, this won't work when using a CDMA SIM in slot 1 (i.e., Verizon). I have no clue why...I can definitely confirm that my experience is the same as that stated above by xtermmin - the GSM SIM will be limited to EDGE (2G only) when the CDMA SIM is active as the data SIM. But with two GSM operators yes one can be LTE/WCDMA and the other can be WCDMA/GSM. I'll confirm real quick just to make double sure but I seem to recall seeing this in the specs and was able to confirm it myself. I've attached a screenshot showing this - I have SIM 2 enabled for data as you can see but SIM 1 still shows voice-only on UMTS and thus is not just limited to 2G. I hope they fix this phone so that CDMA SIMs will have this same functionality...for now though I can say confidently that two GSM SIMs can be operated as LTE/WCDMA on primary SIM and WCDMA/GSM on secondary SIM simultaneously...really great news considering all the EDGE networks seem to be on their last leg!
EDIT: Oh - and don't mind the fact that the "Cellular Network State" is shown as disconnected - in slot 1 I have an old T-Mobile SIM just for this test - it isn't active at the moment on an account. But for demonstration hopefully it does suffice as it definitely has the phone connected to 3G service on SIM 1 while having LTE service on SIM 2. Also - I've included a 2nd screenshot to show that with Verizon LTE/CDMA on SIM 1 (shown as carrier '123456'), SIM 2 will be limited to GSM-only on T-Mo...really weird - not sure why this limitation exists for CDMA users - I think it's a ZTE bug as simultaneous CDMA 1X and WCDMA is possible with T-Mobile as the data-SIM.
flyer_andy said:
Hi! Amazingly, yeah this works...you can have LTE on one SIM and WCDMA 3G on the other (voice only). I tested this with two T-Mobile SIMs and was kind of shocked as in the past it seems like all dual-SIM phones are limited to GSM-only on one of the two SIMs, as has been mentioned above...
But...strangely, this won't work when using a CDMA SIM in slot 1 (i.e., Verizon). I have no clue why...I can definitely confirm that my experience is the same as that stated above by xtermmin - the GSM SIM will be limited to EDGE (2G only) when the CDMA SIM is active as the data SIM. But with two GSM operators yes one can be LTE/WCDMA and the other can be WCDMA/GSM. I'll confirm real quick just to make double sure but I seem to recall seeing this in the specs and was able to confirm it myself. I've attached a screenshot showing this - I have SIM 2 enabled for data as you can see but SIM 1 still shows voice-only on UMTS and thus is not just limited to 2G. I hope they fix this phone so that CDMA SIMs will have this same functionality...for now though I can say confidently that two GSM SIMs can be operated as LTE/WCDMA on primary SIM and WCDMA/GSM on secondary SIM simultaneously...really great news considering all the EDGE networks seem to be on their last leg!
EDIT: Oh - and don't mind the fact that the "Cellular Network State" is shown as disconnected - in slot 1 I have an old T-Mobile SIM just for this test - it isn't active at the moment on an account. But for demonstration hopefully it does suffice as it definitely has the phone connected to 3G service on SIM 1 while having LTE service on SIM 2. Also - I've included a 2nd screenshot to show that with Verizon LTE/CDMA on SIM 1 (shown as carrier '123456'), SIM 2 will be limited to GSM-only on T-Mo...really weird - not sure why this limitation exists for CDMA users - I think it's a ZTE bug as simultaneous CDMA 1X and WCDMA is possible with T-Mobile as the data-SIM.
Click to expand...
Click to collapse
Ah, so it's another CDMA quirk. Good to know!
xtermmin said:
Ah, so it's another CDMA quirk. Good to know!
Click to expand...
Click to collapse
Yeah for sure...I love the phone and all but I really hope ZTE will just fix these annoying CDMA bugs already...Seems like they could fix this stuff with or without Verizon's approval - from the beginning they've kind of hamstrung CDMA and I've never really understood why. Another bug I noticed was that when switching calls to the T-Mobile SIM, VoLTE has to be kicked into gear by toggling the VoLTE toggle and sometimes even putting the phone into airplane mode for a second...from what I've heard this is a unique problem to CDMA use as well.
flyer_andy said:
Hi! Amazingly, yeah this works...you can have LTE on one SIM and WCDMA 3G on the other (voice only). I tested this with two T-Mobile SIMs and was kind of shocked as in the past it seems like all dual-SIM phones are limited to GSM-only on one of the two SIMs, as has been mentioned above...
But...strangely, this won't work when using a CDMA SIM in slot 1 (i.e., Verizon). I have no clue why...I can definitely confirm that my experience is the same as that stated above by xtermmin - the GSM SIM will be limited to EDGE (2G only) when the CDMA SIM is active as the data SIM. But with two GSM operators yes one can be LTE/WCDMA and the other can be WCDMA/GSM. I'll confirm real quick just to make double sure but I seem to recall seeing this in the specs and was able to confirm it myself. I've attached a screenshot showing this - I have SIM 2 enabled for data as you can see but SIM 1 still shows voice-only on UMTS and thus is not just limited to 2G. I hope they fix this phone so that CDMA SIMs will have this same functionality...for now though I can say confidently that two GSM SIMs can be operated as LTE/WCDMA on primary SIM and WCDMA/GSM on secondary SIM simultaneously...really great news considering all the EDGE networks seem to be on their last leg!
EDIT: Oh - and don't mind the fact that the "Cellular Network State" is shown as disconnected - in slot 1 I have an old T-Mobile SIM just for this test - it isn't active at the moment on an account. But for demonstration hopefully it does suffice as it definitely has the phone connected to 3G service on SIM 1 while having LTE service on SIM 2. Also - I've included a 2nd screenshot to show that with Verizon LTE/CDMA on SIM 1 (shown as carrier '123456'), SIM 2 will be limited to GSM-only on T-Mo...really weird - not sure why this limitation exists for CDMA users - I think it's a ZTE bug as simultaneous CDMA 1X and WCDMA is possible with T-Mobile as the data-SIM.
Click to expand...
Click to collapse
Thanks for the info. Has this issue been sorted out to your knowledge? We livein 2 different regions, but would only consider getting the Aussie release of this phone this month if it can seamlessly handle 4g/3g, using 2 SIM cards where both are capable of LTE. Will this work? Does it automatically switch data to SIM 2 in order to take 3G voice call, or does it temp. disable data on sim 1 (4g) to allow SIM 2 call?
RoOSTA
Actually, worse than I thought...but only a bit
roosta said:
Thanks for the info. Has this issue been sorted out to your knowledge? We livein 2 different regions, but would only consider getting the Aussie release of this phone this month if it can seamlessly handle 4g/3g, using 2 SIM cards where both are capable of LTE. Will this work? Does it automatically switch data to SIM 2 in order to take 3G voice call, or does it temp. disable data on sim 1 (4g) to allow SIM 2 call?
RoOSTA
Click to expand...
Click to collapse
Hi - I just tried this and here's what I found:
If active data is on SIM 2, a call to or from SIM 1 is possible on UMTS (WCDMA 3G) but this will terminate the LTE connection on SIM 2 for the duration of the call. However, a call on SIM 2 will not be a problem for data unless SIM 2 is on EDGE or less...on UMTS or LTE (i.e., a VoLTE call) you'll still have data during the call.
If data is on SIM 1, a call to or from SIM 2 is only possible on EDGE!!! I didn't know this! I guess SIM 2 will always be GSM-only if SIM 1 is the active data SIM. And also - you will lose LTE data on SIM 1 if you receive or place a call on SIM 2 EDGE/GPRS.
So...it looks like the situation isn't as good as I'd hoped - if 3G calling is necessary on a particular SIM card at all times, that SIM should be placed in slot 1. And it'll work well even when SIM 2 is the active data SIM. But, if you need 3G calling at all times on both SIMs, you may be out of luck.
Also, the Axon does not seem to allow you to change the data SIM in the middle of the call...in this scenario, SIM 2 was on LTE and was the active data SIM, and SIM 1 was on UMTS (calls only). I made a call on SIM 1 and then changed the data to SIM 1 to try and get 3G data during my call...but it didn't connect to data until I hung up the call...so it seems that the service state gets frozen when you make a call, in a way.
I hope this info helps...seems like kind of a mixed bag, unfortunately.
flyer_andy said:
Hi - I just tried this and here's what I found:
If active data is on SIM 2, a call to or from SIM 1 is possible on UMTS (WCDMA 3G) but this will terminate the LTE connection on SIM 2 for the duration of the call. However, a call on SIM 2 will not be a problem for data unless SIM 2 is on EDGE or less...on UMTS or LTE (i.e., a VoLTE call) you'll still have data during the call.
If data is on SIM 1, a call to or from SIM 2 is only possible on EDGE!!! I didn't know this! I guess SIM 2 will always be GSM-only if SIM 1 is the active data SIM. And also - you will lose LTE data on SIM 1 if you receive or place a call on SIM 2 EDGE/GPRS.
So...it looks like the situation isn't as good as I'd hoped - if 3G calling is necessary on a particular SIM card at all times, that SIM should be placed in slot 1. And it'll work well even when SIM 2 is the active data SIM. But, if you need 3G calling at all times on both SIMs, you may be out of luck.
Also, the Axon does not seem to allow you to change the data SIM in the middle of the call...in this scenario, SIM 2 was on LTE and was the active data SIM, and SIM 1 was on UMTS (calls only). I made a call on SIM 1 and then changed the data to SIM 1 to try and get 3G data during my call...but it didn't connect to data until I hung up the call...so it seems that the service state gets frozen when you make a call, in a way.
I hope this info helps...seems like kind of a mixed bag, unfortunately.
Click to expand...
Click to collapse
Thanks for the. That's pretty backwards by ZTE. Makes no sense. SIM 1 and 2 need to work the same way regardless of WHICH SIM had the 3G incoming call and which had 4G data active at the same time. I read the above as SIM 2 can be 2G only, or is the main SIM for 4G data....so 3G calls can be taken on SIM 1. Yep, backwards!
Axon hasn't sold me. Audio on a phone is important, but the HTC front facing speakers get easily clogged, then it looks horrendous. I'm favouring one of OP3T (as i believe this too has unlocked bootloader and root), or worst case - LG v20 or G5 dual...but neither will be given unlocked bootloaders.
RoOSTA
roosta said:
Thanks for the. That's pretty backwards by ZTE. Makes no sense. SIM 1 and 2 need to work the same way regardless of WHICH SIM had the 3G incoming call and which had 4G data active at the same time. I read the above as SIM 2 can be 2G only, or is the main SIM for 4G data....so 3G calls can be taken on SIM 1. Yep, backwards!
Axon hasn't sold me. Audio on a phone is important, but the HTC front facing speakers get easily clogged, then it looks horrendous. I'm favouring one of OP3T (as i believe this too has unlocked bootloader and root), or worst case - LG v20 or G5 dual...but neither will be given unlocked bootloaders.
RoOSTA
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So, I just tried it again and it looks like I was able to achieve a UMTS 3G connection on both SIMs even during a call on SIM 1...perhaps my initial test was in error somehow...not sure. But it looks like dual 3G is possible after all...there may be hope!
flyer_andy said:
So, I just tried it again and it looks like I was able to achieve a UMTS 3G connection on both SIMs even during a call on SIM 1...perhaps my initial test was in error somehow...not sure. But it looks like dual 3G is possible after all...there may be hope!
Click to expand...
Click to collapse
Are you sure both are running 3g, because I have had devices that always showed 3g even when connect to 2g networks, really need to test with an app the can see both sims at the same time like network cell info mini.
Kevinreid1 said:
Are you sure both are running 3g, because I have had devices that always showed 3g even when connect to 2g networks, really need to test with an app the can see both sims at the same time like network cell info mini.
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Yes I'm sure. I was using LTE discovery and the Settings --> Phone Status...not just the signal type indication. It can run dual 3G UMTS and/or HSPA+.
---------- Post added at 03:15 AM ---------- Previous post was at 03:11 AM ----------
Kevinreid1 said:
Are you sure both are running 3g, because I have had devices that always showed 3g even when connect to 2g networks, really need to test with an app the can see both sims at the same time like network cell info mini.
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Also, if you look at post #6 of this thread you'll see two screenshots in the attachments that show dual LTE/UMTS connections on SIM 2 and 1 respectively.
Awesome and Thanks...
Kevinreid1 said:
Awesome and Thanks...
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Sure thing. Just to make double sure, I just put my FreedomPop (AT&T) SIM in with my T-Mobile one and set both to WCDMA...And it's confirmed that dual 3G works fine (see screenshots below). So you should be ok! AT&T has decommissioned 2G completely so the fact that I could sustain a dual T-Mobile/AT&T connection when T-Mobile is active for 3G data should hopefully prove that the Axon 7 can get dual 3G. One caveat though - with a Verizon SIM in slot 1, slot 2 is still 2G only...So you will be limited to 2G in slot 2 if you have a CDMA SIM in slot 1 which is data-active. But two GSM SIMs should be ok. Good luck!
flyer_andy said:
Sure thing. Just to make double sure, I just put my FreedomPop (AT&T) SIM in with my T-Mobile one and set both to WCDMA...And it's confirmed that dual 3G works fine (see screenshots below). So you should be ok! AT&T has decommissioned 2G completely so the fact that I could sustain a dual T-Mobile/AT&T connection when T-Mobile is active for 3G data should hopefully prove that the Axon 7 can get dual 3G. One caveat though - with a Verizon SIM in slot 1, slot 2 is still 2G only...So you will be limited to 2G in slot 2 if you have a CDMA SIM in slot 1 which is data-active. But two GSM SIMs should be ok. Good luck!
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So Awesome, does anyone if the same is true for the new ZTE Blade v8 Pro, I sure hope so as I am looking to add both of these to my collection, Using prepaid H2O wireless for calls and text and FreedomPop LTE or Global sims for data... What would be the best setup for that data ( FreedomPop ) on sim 1 or sim 2. H20 is a AT&T MVNO
Kevinreid1 said:
So Awesome, does anyone if the same is true for the new ZTE Blade v8 Pro, I sure hope so as I am looking to add both of these to my collection, Using prepaid H2O wireless for calls and text and FreedomPop LTE or Global sims for data... What would be the best setup for that data ( FreedomPop ) on sim 1 or sim 2. H20 is a AT&T MVNO
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Click to collapse
The only limitation vis-a-vis SIM 1 vs. 2 slot I know of when it comes to GSM SIMs relates to WiFi calling... You can only get WiFi calling on SIM 1. But that shouldn't matter for FreedomPop or H2O I would think so it shouldn't matter. Also, CDMA SIMs only work in slot 1 but of course that should affect you either. So either slot should be fine I'd think!
Hi guys,
For anyone with a dual SIM model of the LG V20, can you please do myself and others a big favour?
I need to determine the phones capabilities and functionality when it comes to dual sim capability. We know this is only dual standby, but I need to determine a few things. Can someone please answer these questions ONLY if you have this phone and ONLY if you've tested it?
1) Can a 3G phone (voice) call be received on a SIM whilst the other SIM's 4G data is in use (Y/N)?
2) If yes, does the 4G data SWITCH OVER to the other SIM to allow that voice call to come through, or:
3) Does the 4G data temporarily cut out on the "data active" SIM for the other SIM to allow inbound 3G voice call?
4) Can you deactivate test to confirm with 100% accutracy only 4g and/or 3G is being used on both SIMs?
Any help from current users (or if anyone can post a video oft he settings/functionality), that would be awesome!
Thank you
RoOSTA
Please don't all jump up at once.
Top
Hi. Cant exactly verify this because in the Phillippines H990DS. We dont have voice call over 3G.
But if it helps, i have a viber account on SIM2s number. I use SIM1 as Data provider.
When i get a viber call on SIM2s number, it doesnt switch but instead uses SIM1s data.
But not entirely sure if that works the same as Voice over 3G
When one sim is in use the other is disabled, I think the only phone that does this is huawei mate 7, but that's 4G+2G or 3G+2G.
kms108 said:
When one sim is in use the other is disabled, I think the only phone that does this is huawei mate 7, but that's 4G+2G or 3G+2G.
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Click to collapse
Not entirely. Yes, they are dual standy by...but when 4G is active on SIM and call comes in on SIM 2, it should eityhert SWITCH the data to SIM 2 to allow call to come through, or temporarily disable 4G on SIM 1 for the call to get through. See other models that dpo this:
http://whirlpool.net.au/wiki/dual_sim_4g3g_phones
This phone has the new chipset that can allow this. Have you actually tried this, or have any images to confirm your findings?
RoOSTA
roosta said:
No it's not.
http://whirlpool.net.au/wiki/dual_sim_4g3g_phones
This phone has the new chipset that can allow this. Have you actually tested gopt any images?
RoOSTA
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You asked a question, i help by replying, if you dont believe me, fine.
kms108 said:
You asked a question, i help by replying, if you dont believe me, fine.
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You have the HK model, right? Makes no sense why two dozen or more other models out there with this chipset can allow 4g/3g (evenif 1 is temporarily disabled) and this new flagship doesnt.
i got the H990DS today. I have Tmo and AT&T. it has 3G standby. No matter which SIM i select in 4G the other always holds 3G.
jdubya45 said:
i got the H990DS today. I have Tmo and AT&T. it has 3G standby. No matter which SIM i select in 4G the other always holds 3G.
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Perfect. Thanks for confirming. Sorry to be a pain in the butt but could you screenshot that on the phone and post to confirm {if signal at top left status bar shows this}?
Sent from my LG-H818 using XDA-Developers mobile app
Sure thing. :good:
..
here is my findings for a few days, i bought a data sim card (only internet) and added to my LG V20 as SIM2
1) yes, you can receive calls while the data is working on the second sim
2,3) in my case, when i receive a call from SIM1 (4G), the data SIM2 still connects between 4G and 3.5G, but in both cases the data is been cutted off and unable to do anything
(this was tested via hotspot the SIM2 and getting a call on SIM1, happened multiple occasions)
4) until now, SIM1 and SIM2 in my device works both on 4G (battery drainage is surprisingly holding up)(tested via switching between SIM1 and SIM2 Data connection)
one note to be considered, the data speed was very low, i called my provider and adviced me to switch to another device (portable router adviced), i switched the sim to another device (Note 3) and the net speed was signifacantly better for a while
Silver Mask said:
here is my findings for a few days, i bought a data sim card (only internet) and added to my LG V20 as SIM2
1) yes, you can receive calls while the data is working on the second sim
2,3) in my case, when i receive a call from SIM1 (4G), the data SIM2 still connects between 4G and 3.5G, but in both cases the data is been cutted off and unable to do anything
(this was tested via hotspot the SIM2 and getting a call on SIM1, happened multiple occasions)
4) until now, SIM1 and SIM2 in my device works both on 4G (battery drainage is surprisingly holding up)(tested via switching between SIM1 and SIM2 Data connection)
one note to be considered, the data speed was very low, i called my provider and adviced me to switch to another device (portable router adviced), i switched the sim to another device (Note 3) and the net speed was signifacantly better for a while
Click to expand...
Click to collapse
Your answer is helpful, Silver Mask! Just to confirm, if I'm on a call on SIM2, I would not be able to use the internet on SIM1 at the same time? (e.g. if I wanted to use Google Maps with SIM1 sata while I have a SIM2 call on speaker). If I understand correctly, you're saying I can receive a call on SIM2 while I'm using SIM1 data but once I pick up the call, the data from SIM1 will be temporarily disabled?
rehtse said:
Your answer is helpful, Silver Mask! Just to confirm, if I'm on a call on SIM2, I would not be able to use the internet on SIM1 at the same time? (e.g. if I wanted to use Google Maps with SIM1 sata while I have a SIM2 call on speaker). If I understand correctly, you're saying I can receive a call on SIM2 while I'm using SIM1 data but once I pick up the call, the data from SIM1 will be temporarily disabled?
Click to expand...
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Either disabled as an extream case, 50% of the time it switch to lower band (from 4G/LTE to 3G), even then the data feels slow, but usually any navigation app and social messaging apps doesn't get affected that much, it is just annoying
Hi devs! got new Axon7.... really hoping to run both CDMA SIMS at the same time. Can we start a thread for dual SIM use, where neither is a GSM SIM? I'd really like to run both numbers on this phone. Tried all kinds of settings, currently on nightly LOS. I've tried nearly every APN setting.
kcnorden said:
Hi devs! got new Axon7.... really hoping to run both CDMA SIMS at the same time. Can we start a thread for dual SIM use, where neither is a GSM SIM? I'd really like to run both numbers on this phone. Tried all kinds of settings, currently on nightly LOS. I've tried nearly every APN setting.
Click to expand...
Click to collapse
Unfortunately, only SIM1 is wired to the phone's CDMA antenna (GSM/CDMA/HSPA/EVDO/LTE). SIM2 is only wired to GSM/HSPA/LTE. As the phone is not approved by Verizon, you need CDMA to be able to authenticate the device with the network, so even if you wanted to go Verizon-LTE-data-only on SIM2, it won't be able to connect. For any Verizon-based provider, it's SIM1 or bust.
xtermmin said:
Unfortunately, only SIM1 is wired to the phone's CDMA antenna (GSM/CDMA/HSPA/EVDO/LTE). SIM2 is only wired to GSM/HSPA/LTE. As the phone is not approved by Verizon, you need CDMA to be able to authenticate the device with the network, so even if you wanted to go Verizon-LTE-data-only on SIM2, it won't be able to connect. For any Verizon-based provider, it's SIM1 or bust.
Click to expand...
Click to collapse
I was afraid of that, or access to the modem, for example. If we can't connect via hardware, would it be possible to emulate or allow for software control/flipping "sims" so to speak? Perhaps moving this to the dev forum... I really appreciate your expertise and help. I'd like to keep the second # on PP, but might have to somehow port or forward to to the main/other VZW connection.
With all that said, I recall getting SIM2 working..... so I just checked. disabled SIM1, and after a few jiggles, I get LTE on SIM2, can cruise internet... so I might ask, if a hardware wiring restriction is there, my setup doesn't seem to reflect it. I can get ping test on ip4 to work.... ????
kcnorden said:
I was afraid of that, or access to the modem, for example. If we can't connect via hardware, would it be possible to emulate or allow for software control/flipping "sims" so to speak? Perhaps moving this to the dev forum... I really appreciate your expertise and help. I'd like to keep the second # on PP, but might have to somehow port or forward to to the main/other VZW connection.
With all that said, I recall getting SIM2 working..... so I just checked. disabled SIM1, and after a few jiggles, I get LTE on SIM2, can cruise internet... so I might ask, if a hardware wiring restriction is there, my setup doesn't seem to reflect it. I can get ping test on ip4 to work.... ????
Click to expand...
Click to collapse
It seems to be very fickle, constantly having to toggle radio, network protocols, and seems to be either/or. After re-activating the SIM1, the SIM2 signal meter will show an R, with no bars of signal. The R stays, but no SMS will send out. If I disable SIM1, LTE signal bars on SIM2, no R..... and internet works fine. still no SMS on SIM2. double checked APN settings for pageplus(TRACFONE.VZWENTP), they are customized to included MMS stuff, oddly, it won't add with MCC310 and MNC012 like PP tells me, but matched to my S4 with PP, it adds well as MCC311/MNC480(same as VZW APN).
(Wondering about ZTE AXON 7 dual SIM VZW and Lineage????)All other LOS 14.2 nighlty, speakers, battery mgmt, camera (back side button seemed to have worked BEFORE LOS?) u know, no screen problems. unlock, TWRP, root(if you want), LOS whatever you like.
Should I be pursuing older modem firmware to resolve dual CDMA SIM capabilities? APN or protcol settings? specific dual SIM ROMs? Virtual SIM swapping driod zip? Any direction would be duly noted by the Internet. thx all.
bump. I really dont want to flip SIMs every few days. Any help please?
So, i have to constantly switch SIMs between slot 1 and 2, hoping no SMS messages expire? Cmon, is no one going to help us find a solution to this?
kcnorden said:
So, i have to constantly switch SIMs between slot 1 and 2, hoping no SMS messages expire? Cmon, is no one going to help us find a solution to this?
Click to expand...
Click to collapse
The user above already answered your question correctly, to the best of my knowledge - this phone will not be able to achieve what you desire. Maybe you can get an LTE-only connection on slot 2 with a CDMA SIM but even that's iffy as the Axon 7 typically rejects CDMA SIMs in slot 2, as I'm sure you've noted. Not sure if LOS allows it but even if so I would think the same technical limitation applies.
This isn't a software limitation...it's a hardware limitation. Thus we can't do much about it.
And for reference, the other Verizon-friendly dual SIM phone, the Xiaomi Mi Note 2, also has this limitation though it's slightly better as you can keep both CDMA SIMs in both slots and switch between. Perhaps that's more what you're looking for?
hot-swapping SIMS seems to cause connection issues, best to swap while powered down? this stinks, anyone? HELP
Well, if it is a hardware issue, can we not sym link or software mod to allow us not to remove SIM's all the time, missing messages? The Xiaomi Note2 seems like the fix, but .....B13..... that's why the Axon7 seems a better fr for VZW towers...
I really appreciate the info.
kcnorden said:
Well, if it is a hardware issue, can we not sym link or software mod to allow us not to remove SIM's all the time, missing messages? The Xiaomi Note2 seems like the fix, but .....B13..... that's why the Axon7 seems a better fr for VZW towers...
I really appreciate the info.
Click to expand...
Click to collapse
The Mi Note 2 Global version has band 13 and 4 and 2 so it's totally compatible with Verizon. Also CDMA 0 and 1 so there are no limitations in this respect.
flyer_andy said:
The Mi Note 2 Global version has band 13 and 4 and 2 so it's totally compatible with Verizon. Also CDMA 0 and 1 so there are no limitations in this respect.
Click to expand...
Click to collapse
Really? Just looked up the Note2, looks equally impressive. Might hafta swappa the AXON7 to note2..... Back to the AXON7 , does anyone have experience making it work with CDMA only on SIM2? I could live with the AXON if SIM2 would get/send SMS.
flyer_andy said:
The Mi Note 2 Global version has band 13 and 4 and 2 so it's totally compatible with Verizon. Also CDMA 0 and 1 so there are no limitations in this respect.
Click to expand...
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Is it known if both SIM slots on the Mi Note 2 Global are hooked up to the CDMA antenna?
xtermmin said:
Is it known if both SIM slots on the Mi Note 2 Global are hooked up to the CDMA antenna?
Click to expand...
Click to collapse
Guess we have to buy one and see. report back in a bit.
flyer_andy said:
The Mi Note 2 Global version has band 13 and 4 and 2 so it's totally compatible with Verizon. Also CDMA 0 and 1 so there are no limitations in this respect.
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Click to collapse
So, Flyer_Andy... does the VZW VMMO SIM work in slot 2? :angel:
kcnorden said:
So, Flyer_Andy... does the VZW VMMO SIM work in slot 2? :angel:
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Click to collapse
Yes it seemed to work in both slots. Unfortunately I sold my Note 2 as I really prefer the Axon 7 but I do seem to recall that either slot worked just fine. I seem to recall trying two different CDMA SIMs and independently they worked when you changed the data to the one you wanted to use. But they did not work simultaneously. Hopefully I'm remembering correctly as this was a few weeks ago but I'm pretty sure the Note 2 did allow you to toggle between two CDMA SIMs without issue.
In general, the Note 2 had better radio firmware than the Axon 7...much more stable in every way. It was a very fine device though I didn't like the pentile display and that in the end was why I sold it. I also like to use a screen protector and the curved screen was really annoying as you have to use a wet application film to get the best results and I'm not very good at applying those.
Hey...I just wanted to update this one as I got ahold of a Xiaomi Mi Mix 2 and tested it with two active Verizon SIMs. The results are good vis-a-vis the OP's issue.
You can have two CDMA SIMs in the Mix 2 and while you won't get simultaneous CDMA connection (even with VoLTE connected...which would seem to "free up" the CDMA connection for use on the opposing SIM but perhaps this isn't techincally feasible) on both SIMs, you will be able to switch back and forth without changing anything relating to the SIMs' physical position, unlike the Axon 7. So, in case you're willing to throw about $550 at a new Xiaomi Mi Mix 2, it looks like dual SIM-single standby operation can be achieved with two CDMA SIMs. The Xiaomi Mi Note 2 Global almost certainly can perform in this way as well.
ADD'L INFO: I tried this setup for an hour or so and I ran into some connectivity issues, where the SIMs would be stuck on an inactive CDMA connection or CDMA+EvDO 3G. To resolve this, I had to go into the testing menu (*#*# 4636 *#*# in the dialer) and manually turn the radio off totally (airplane mode wasn't sufficient) and then turn the radio back on. This seemed to resolve things permanently.
Also, this is unrelated, but for AT&T/Verizon users, the Mi Mix 2 looks to be capable of CDMA + UMTS (3G) simultaneous service, which is a godsend as presently the Axon 7 only allows EDGE + CDMA and thus creates service issues for AT&T customers in 3G-only areas.
Figured I'd ask here instead of creating a new thread.
I am looking for a dual sim phone to use where one would be Verizon and other sim would be AT&T. I don't care which sim gives me data as long as both get calls.
Would Axon 7 work for this? Thanks for any help.
Pr20 said:
Figured I'd ask here instead of creating a new thread.
I am looking for a dual sim phone to use where one would be Verizon and other sim would be AT&T. I don't care which sim gives me data as long as both get calls.
Would Axon 7 work for this? Thanks for any help.
Click to expand...
Click to collapse
Hello...yes... The Axon 7 should work in your use case most of the time as it can pick up CDMA 1X alongside WCDMA and LTE, the latter two of which are the technologies that AT&T uses. So, as long as you're in an active Verizon 1X area, and you keep the data SIM on AT&T, you should be able to pick up calls on both SIMs.
It is important to note, however, that Verizon does have some coverage areas which are dependent on voice-over-LTE for calls and text. So in these areas, you will not be able to receive voice service or texting on Verizon while using your AT&T SIM for data. But, these areas should be relatively rare, at least for now.