Hello everyone.
I've had the S3 Neo for a week and have been enjoying it so far, but I realized something weird. I have two sim cards, one is a corporate number with 3G and the other one if my personal number, also with a 3G plan. My phone only connects at speed H/H+ on the sim in slot 2, doesn't matter which sim, the sim in slot 1 only connects to Edge.
Before someone says that the phone can not connect to two 3G networks at the same time, I know that. For the tests I made I changed the configuration, leaving one sim with only GSM connection and the other one with WCDMA.
Does anyone know what could be the issue and how to proceed to fix it?
Thanks in advance.
No one?
I just need to know if there's a fix for this or I have to send it back to the store.
Appreciate any help.
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.
Hey Guys,
Bought a new zenfone 3 (ZE552KL). Unable to receive a call on SIM slot 1 ( Micro-sd). Caller hears a "Phone is switched off" message. The same SIM however works in the nano SIM slot 2. Called my network operator and got my sim replaced but the caller still gets the same message. Performed a factory reset as suggested by Asus customer care, still no joy. Finally ordered a replacement from Asus for the zenfone 3 ( ZE552KL) and SIM slot 1 still gives me the same problem i.e. the caller getting a " phone is switched off " message.
Anyone else facing problems with the zenfone 3 in terms of sim slots related connectivity?
junaid.mulla said:
Hey Guys,
Bought a new zenfone 3 (ZE552KL). Unable to receive a call on SIM slot 1 ( Micro-sd). Caller hears a "Phone is switched off" message. The same SIM however works in the nano SIM slot 2. Called my network operator and got my sim replaced but the caller still gets the same message. Performed a factory reset as suggested by Asus customer care, still no joy. Finally ordered a replacement from Asus for the zenfone 3 ( ZE552KL) and SIM slot 1 still gives me the same problem i.e. the caller getting a " phone is switched off " message.
Anyone else facing problems with the zenfone 3 in terms of sim slots related connectivity?
Click to expand...
Click to collapse
Haven't tried SIM 2 but certainly has no any kind of issue from SIM 1. Call and cellular data works perfectly fine. Have you checked operator vs supported frequency? And also suitable firmware for the country?
sanctitude888 said:
Haven't tried SIM 2 but certainly has no any kind of issue from SIM 1. Call and cellular data works perfectly fine. Have you checked operator vs supported frequency? And also suitable firmware for the country?
Click to expand...
Click to collapse
Checked operator against device compatibility on frequencycheck.com and it shows that the device is compatible with all bands.
I have no such issue. Both my sim1/2 work on either 2G/2G, 2G/3G, 3G/2G or 3G/3G modes. No 4G network here.
i have onr question can we get call on both the lines at same time i mean if i am talking on sim 1 can i get call on sim 2 at same time plz rply
Sent from my VIE-L29 using XDA-Developers mobile app
I just upgraded my SM-A700FD to Android 6.0.1 and had trouble with Dual SIM operations.
My SIM 1 is on LTE data whereas SIM 2 has no data. Whenever I make a call on SIM 2 (incoming or outgoing) my data connection on SIM 1 is lost. I have enabled Dual SIM Always On in SIMCard Manager under Setting.
I tried in Safe Mode and still the same. Does anyone has the same issue? This seriously render the Dual SIM phone unusable.
The SIM Card Manager also force SIM 2 to 2G if SIM 1 is set to LTE/3G/2G (Autoconnect), even though my SIM 2 is on 3G network but using only voice and text.
When I am using data on SIM 1 to browse or running Apps, I can receive SMS text on SIM 2 without interrupting SIM 1 data, but as soon a voice call is established on SIM 2 the data on SIM 1 is lost.
Would appreciate it if anyone can help.
Thanks!
Hey there
I have the following situation and basically this is the reason why I've bought a dual SIM
SIM 1 - Vodafone Italy
SIM 2 - Yallo Switzerland
SIM 1 is used ONLY for receiving phone calls and I want to have it 24/7
SIM 2 is more a working SIM, I am using it for phone and internet
Evening I want to switch off SIM 2, don't want to be bothered with calls nor I care for internet.
First problem when I try to "disable" SIM 2 I got the message that the SIM is set as primary (whatever it means) so I cannot disable it (why ????????????)
Trying to findo out what is the reason I have discovered that if I select data on SIM 1, then I can switch off SIM 2 (whaaaaat ?????)
Seems that I am not free to do it
The other thing is ... to "disable" the SIM, I have to go to Settings | SIM and mobile network click on SIM 2 and disable
This is not what you want to do just before going to sleep, I expected something very easy to switch off SIM 1 or 2 based on needs
How can I solve the problem ?
Cheers
Steve