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Hi Everyone,
I'm usually just a reader on XDA, but I have found a problem that appears not to have been solved and wondered if anyone had any insight.
Problem Summary
When in an area (or network) with only HSPA and UMTS (strong HSPA/UMTS signal, but with no LTE or 2G available), the phone will drop from H+ to 3G erratically, always dropping the data connection. Traditional phone calls are not affected.
Detailed Description
I have a OnePlus Two and have 2 SIM cards. My first SIM Card is with Bell Canada (Virgin), and the second SIM Card is with WIND Mobile Canada.
Neither Bell nor WIND operate a 2G network, so the lowest the service can fall to is UMTS/3G.
Initially, I didn't notice the problem because Bell also operates an LTE network, and there is no problem with dropping the data connections when on LTE.
When I switched to the WIND SIM card (which only operates HSPA and UMTS), I noticed a problem where the phone would initially connect to H+, begin downloading whatever is needed (say, streaming music), but then part way through the download, the connection would switch to 3G, and the data would effectively stop. Within a minute, the service would jump back to H+ and download some more, but this cycle would continue (H+ --> 3G --> H+ --> 3G... ), with no way of knowing 1) how long the H+ connection would last before dropping to 3G (usually less than 30 seconds), and 2) after dropping to 3G, how long before going back to H+. This problem makes the phone almost useless when there is no LTE.
The most obvious troubleshooting I did was move to locations of better signal but I quickly ruled that out, as nothing seems to remove this problem. Other things I tried was to: move locations in the city, reboot phone, hard reset phone, flash most updated version of Oxygen, unlock bootloader, root, try the HSPA Keepalive app, swap SIM1 to SIM2, and many other things.
I originally thought this was a network issue, but I put this WIND SIM in another phone and there was no problem in any way that resembled this problem.
I also ruled out this being a network-specific problem, as I have taken a trip with the Bell SIM to an area where Bell does not have any LTE coverage (only HSPA and UMTS) and the same problem occurs on Bell as with the WIND SIM.
I have found people who had this problem on the OnePlus One tend to recommend using 2G to stabilize the connection, but this is not possible on Bell or WIND. That solution also would not provide adequate data speeds.
Remember this problem only affects data connectivity, as 3G traditional phone calls have no problems.
Question
Does anyone know if there is a way to adjust the conditions when the OnePlus Two will choose to switch from H+ to 3G?
Does anyone have any easier suggestions?
Thank you all in advance, because this rendering this phone almost useless when there is no LTE coverage.
I believe your problem is that phone it's dualsim standby, that means only one modem that alternates signal for both sims, I think normal would be alternating from faster network to slower network on sim without data.
Having to change to g3 between sims theres something stoped in the modem and data connection is also stopped.
You have no problem with voice calls because other sim is automatically turned off and unreachable.
There's nothing you can do if you're forced to only 3g on both sims
By 3g I mean 3g or h+ which to my knowledge are the same
Hope I was helpful and not wrong or more confusing
Sent from my ONE A2005 using Tapatalk
fburgos said:
I believe your problem is that phone it's dualsim standby, that means only one modem that alternates signal for both sims, I think normal would be alternating from faster network to slower network on sim without data.
Having to change to g3 between sims theres something stoped in the modem and data connection is also stopped.
You have no problem with voice calls because other sim is automatically turned off and unreachable.
There's nothing you can do if you're forced to only 3g on both sims
By 3g I mean 3g or h+ which to my knowledge are the same
Hope I was helpful and not wrong or more confusing
Sent from my ONE A2005 using Tapatalk
Click to expand...
Click to collapse
Thanks, I will try disabling the second SIM to see if there is a bug with the dual-sim...
What it currently does with the second SIM is it either shows "R" for roaming or just emergency only, but perhaps there is a software issue so I'll see if disabling the second SIM makes a difference.
biomedeng said:
Thanks, I will try disabling the second SIM to see if there is a bug with the dual-sim...
What it currently does with the second SIM is it either shows "R" for roaming or just emergency only, but perhaps there is a software issue so I'll see if disabling the second SIM makes a difference.
Click to expand...
Click to collapse
Though strange, this workaround fixes the issue. Thank you to fburgos for the suggestion!
So just in case anyone ever finds this issue creeps up on them, the solution is to DISABLE the SIM you are not using. It's not the most convenient workaround to swap SIMs, but the other SIM will be in Emergency Mode, so it really makes no functional difference.
On the technical side, it does appear that there is actually a bug in Android for a very uncommon network configuration. It will only appear in this exact configuration:
SIM1: Network has HSPA/3G only, no LTE or 2G to move to
SIM2: Network also only has HSPA/3G with no LTE or 2G
The non-data SIM does NOT connect to a roaming network (connects with "Emergency Only") - if it connects to a roaming 2G network, this problem does not happen.
The data SIM connects to HSPA/3G
Both SIMs are active
I'm not sure if this will happen anywhere else in the world other than having a WIND Mobile Canada SIM and Bell or TELUS Canada SIM
If anyone has insight on how to report this to Google, or someone else who can confirm my theory, that would be great!
Try this:
1. You need to make sure you have the correct LTE APN selected in mobile networks and LTE as preferred type.
2. Go to dialer and type in this: *#*#4636#*#*
3. Phone Information
4. Set Preferred Network Type to: LTE/GSM (PRL) - you an play with which one you wanna use but the one I said works for sure. on other roms I have" TD-SCDMA, GSM/WCDMA and LTE"
5. Now click TURN OFF RADIO and wait WAIT few secs. will that button turns to Turn Radio ON
6. Now TURN ON RADIO and wait
7. when u see the triangle for the signal is back, at least black , go down and lick SMSC REFRESH then UPDATE.
8. now just go back to APN settings and go into your LTE APN
9. Change Bearer to LTE
biomedeng said:
Hi Everyone,
I'm usually just a reader on XDA, but I have found a problem that appears not to have been solved and wondered if anyone had any insight.
Problem Summary
When in an area (or network) with only HSPA and UMTS (strong HSPA/UMTS signal, but with no LTE or 2G available), the phone will drop from H+ to 3G erratically, always dropping the data connection. Traditional phone calls are not affected.
Detailed Description
I have a OnePlus Two and have 2 SIM cards. My first SIM Card is with Bell Canada (Virgin), and the second SIM Card is with WIND Mobile Canada.
Neither Bell nor WIND operate a 2G network, so the lowest the service can fall to is UMTS/3G.
Initially, I didn't notice the problem because Bell also operates an LTE network, and there is no problem with dropping the data connections when on LTE.
When I switched to the WIND SIM card (which only operates HSPA and UMTS), I noticed a problem where the phone would initially connect to H+, begin downloading whatever is needed (say, streaming music), but then part way through the download, the connection would switch to 3G, and the data would effectively stop. Within a minute, the service would jump back to H+ and download some more, but this cycle would continue (H+ --> 3G --> H+ --> 3G... ), with no way of knowing 1) how long the H+ connection would last before dropping to 3G (usually less than 30 seconds), and 2) after dropping to 3G, how long before going back to H+. This problem makes the phone almost useless when there is no LTE.
The most obvious troubleshooting I did was move to locations of better signal but I quickly ruled that out, as nothing seems to remove this problem. Other things I tried was to: move locations in the city, reboot phone, hard reset phone, flash most updated version of Oxygen, unlock bootloader, root, try the HSPA Keepalive app, swap SIM1 to SIM2, and many other things.
I originally thought this was a network issue, but I put this WIND SIM in another phone and there was no problem in any way that resembled this problem.
I also ruled out this being a network-specific problem, as I have taken a trip with the Bell SIM to an area where Bell does not have any LTE coverage (only HSPA and UMTS) and the same problem occurs on Bell as with the WIND SIM.
I have found people who had this problem on the OnePlus One tend to recommend using 2G to stabilize the connection, but this is not possible on Bell or WIND. That solution also would not provide adequate data speeds.
Remember this problem only affects data connectivity, as 3G traditional phone calls have no problems.
Question
Does anyone know if there is a way to adjust the conditions when the OnePlus Two will choose to switch from H+ to 3G?
Does anyone have any easier suggestions?
Thank you all in advance, because this rendering this phone almost useless when there is no LTE coverage.
Click to expand...
Click to collapse
I have the same problem. Do you already have solved it?
I use only one SIM card so it is not a problem two cards.
really you do not have this problem? if no one knows the solution?
compared with my htc butterfly 2 and another low-end android, one plus 2 running latest Oxygen OS has serious connectivity issues. I compared the signals strength using same sim card in same location (including being connected to the same tower) and One Plus 2 keeps dropping the connection and has really poor signal strength. I have tried the *#*#4636#*#* and tried different network modes, but none of them are helping. Its a real disappointment that the basic feature of this phone is screwed up.
I have tried with CM13 as well. Any ideas if this is a modem version issue?
odeccacccp said:
Try this:
1. You need to make sure you have the correct LTE APN selected in mobile networks and LTE as preferred type.
2. Go to dialer and type in this: *#*#4636#*#*
3. Phone Information
4. Set Preferred Network Type to: LTE/GSM (PRL) - you an play with which one you wanna use but the one I said works for sure. on other roms I have" TD-SCDMA, GSM/WCDMA and LTE"
5. Now click TURN OFF RADIO and wait WAIT few secs. will that button turns to Turn Radio ON
6. Now TURN ON RADIO and wait
7. when u see the triangle for the signal is back, at least black , go down and lick SMSC REFRESH then UPDATE.
8. now just go back to APN settings and go into your LTE APN
9. Change Bearer to LTE
Click to expand...
Click to collapse
Did It.. But it seems like it didn't solve my problem..
Redmi 3S will stay on LTE but then if I lose LTE coverage rather than going to 3G it is often on EDGE/2G only when other phones are on 3G in same location.
Right now only work around seem to be to have a second SIM that seems to fix this bug. But I have a 128GB SD Card in my slot 2.
You can change the network mode by entering phone info by tapping the internal storage in about phone option by 3 times or *#*#4636#*#*
Change network mode to lte/wcdma
It should work but u have to set it everytime you reboot
Device: A2017U
Software: Stock, rooted (if it matters), B29
Sim 1: Tmobile gsm mode (connected to tmobile) for voice only
Sim 2: freedompop gsm/hspa mode (connected to att), for data only
Issue: Device keeps losing connection to tmobile when sim 2 is enabled. My immediate area has relatively poor tmobile coverage so keeping it in 2g (gsm) mode extends battery life. It'll stay connected for a bit, then drops, and doesn't regain until I disable/re-enable sim 2. I haven't tried disableing/re-enabling sim 1, but that may also work.
It seems there's some incompatibility when gsm mode is set.
I haven't tried swapping the sim cards yet as the freedompop sim has been removed from its plastic (both sim cards + sd card currently installed).
I wonder if the issue is because in general sim1 has greater priority, and is being used with a lower/inferior network standard (gsm vs hspa). When both are set to gsm/hspa, no disconnect issues, but signal is a good 10 db weaker on the tmobile side.
Thoughts?
Try flipping the sim orientation, see what that does. I'd also try to let your voice only sim camp on umts. Tmobile has been cannibalizing 2g and lots of the newer towers don't have 2g installed on them.
Harmtan2 said:
Try flipping the sim orientation, see what that does. I'd also try to let your voice only sim camp on umts. Tmobile has been cannibalizing 2g and lots of the newer towers don't have 2g installed on them.
Click to expand...
Click to collapse
I'll definitely give that a shot.
Further research (tmo ........................ att ) , shows that tmo gsm operates at 1900 mhz, while att hspa also operates at 1900. Since the dual sim set up on here is active standby, I wonder if the different carriers operating at the same freq has something to do with it.
Harmtan2 said:
Try flipping the sim orientation, see what that does. I'd also try to let your voice only sim camp on umts. Tmobile has been cannibalizing 2g and lots of the newer towers don't have 2g installed on them.
Click to expand...
Click to collapse
Swapping sims didn't change anything. Looks like I'll just leave it on 3g and call it a day. In fact, most of the usage is data, so the voice sim can be turned off most of the time. I use gv for my primary number, there's an immediate email notification for any missed calls even if the caller hangs up.
No matter what I do, I cannot get this phone to work with both my Verizon and TMO SIMs. I got this phone, above all others, for two reasons... dual sim and TMO wifi calling. Neither work, and I'm about to throw this thing out the window.
The phone works fine with the TMO sim in slot 1, but nothing works in slot 2 anymore. It just says "SIM2:missing or error" or something to that effect. I got it working for about a day with both sims, but the VZW sim would only work in slot 1, not 2. That wasn't ideal, but at least I was able to put the TMO in slot 2. Now, nothing works in slot 2, and the VZW sim will not work in either slot 1 or 2.
I was starting to think somehow slot 2 went bad (and it must have, if the TMO sim won't work in it... right?), but then why doesn't the VZW sim (which works fine in my Moto X Pure) not work in slot 1 like it used to?
I've attached pics with annotations... both from today, and from back in December on the one day they both worked.
Something to check:
Open the dialer, type in *#*#4636#*#*, Phone Information, make sure the Preferred Network Type is set to "LTE/GSM/CDMA auto (PRL)" (marshmallow) or "LTE/CDMA/UMTS auto (PRL)" (nougat).
xtermmin said:
Something to check:
Open the dialer, type in *#*#4636#*#*, Phone Information, make sure the Preferred Network Type is set to "LTE/GSM/CDMA auto (PRL)" (marshmallow) or "LTE/CDMA/UMTS auto (PRL)" (nougat).
Click to expand...
Click to collapse
Looks good to me. This is what I have:
EDIT2:
Something to try:
Stick your Verizon SIM into Slot1, leave Slot2 empty. Go into that 4636 menu and constantly switch between "LTE/GSM/CDMA auto", "LTE/CDMA auto", and "LTE-only". At some point (there's no set amount of tries) the phone will reset its modem state partitions, and should re-connect back to Verizon. Once it does, select "LTE/GSM/CDMA auto" and pop your TMO SIM into Slot2.
xtermmin said:
EDIT2:
Something to try:
Stick your Verizon SIM into Slot1, leave Slot2 empty. Go into that 4636 menu and constantly switch between "LTE/GSM/CDMA auto", "LTE/CDMA auto", and "LTE-only". At some point (there's no set amount of tries) the phone will reset its modem state partitions, and should re-connect back to Verizon. Once it does, select "LTE/GSM/CDMA auto" and pop your TMO SIM into Slot2.
Click to expand...
Click to collapse
I'll have to try that tomorrow. What is tough is that at my house, I have zero Verizon signal. At work, I have zero T-Mobile signal. So I'd have to pull over somewhere on the way to work and do this. Still, it's worth a try.
I just read that 4G *anything* won't work in slot 2, but I seem to remember the day it did work, both SIMs had a 4G signal. Is there any truth to that rumor?
Flapjack said:
I'll have to try that tomorrow. What is tough is that at my house, I have zero Verizon signal. At work, I have zero T-Mobile signal. So I'd have to pull over somewhere on the way to work and do this. Still, it's worth a try.
I just read that 4G *anything* won't work in slot 2, but I seem to remember the day it did work, both SIMs had a 4G signal. Is there any truth to that rumor?
Click to expand...
Click to collapse
Slot1 is hooked up to CDMA, GSM/UMTS, and LTE.
Slot2 is hooked up to GSM/UMTS and LTE.
However, only one slot can be connected to LTE at a time. That slot will be whatever you specify to be the data connection in your Dual-SIM settings.
If you select Slot1 (Verizon) to be your data connection, it'll connect to LTE and CDMA, and Slot2 will connect to GSM.
If you select Slot2 (TMO) to be your data connection, it'll connect to LTE and GSM/UMTS, and Slot1 will connect to CDMA.
xtermmin said:
Slot1 is hooked up to CDMA, GSM/UMTS, and LTE.
Slot2 is hooked up to GSM/UMTS and LTE.
However, only one slot can be connected to LTE at a time. That slot will be whatever you specify to be the data connection in your Dual-SIM settings.
If you select Slot1 (Verizon) to be your data connection, it'll connect to LTE and CDMA, and Slot2 will connect to GSM.
If you select Slot2 (TMO) to be your data connection, it'll connect to LTE and GSM/UMTS, and Slot1 will connect to CDMA.
Click to expand...
Click to collapse
Dependant on the T-Mobile network he's on. With At&t, if you select slot 1 (Verizon) as your data you will get nothing on slot 2 as it converts slot 2 to 2g only and At&t removed 2g from their service. This is the issue I ran into with running a CDMA card in slot 1. 2 GSM cards works fine but once you run a CDMA it severely limits slot 2. Running data on slot 2 allowed Verizon to use calling and texts fine.
Sent from my MHA-L29 using Tapatalk
xtermmin said:
Slot1 is hooked up to CDMA, GSM/UMTS, and LTE.
Slot2 is hooked up to GSM/UMTS and LTE.
However, only one slot can be connected to LTE at a time. That slot will be whatever you specify to be the data connection in your Dual-SIM settings.
If you select Slot1 (Verizon) to be your data connection, it'll connect to LTE and CDMA, and Slot2 will connect to GSM.
If you select Slot2 (TMO) to be your data connection, it'll connect to LTE and GSM/UMTS, and Slot1 will connect to CDMA.
Click to expand...
Click to collapse
wingzfan said:
Dependant on the T-Mobile network he's on. With At&t, if you select slot 1 (Verizon) as your data you will get nothing on slot 2 as it converts slot 2 to 2g only and At&t removed 2g from their service. This is the issue I ran into with running a CDMA card in slot 1. 2 GSM cards works fine but once you run a CDMA it severely limits slot 2. Running data on slot 2 allowed Verizon to use calling and texts fine.
Sent from my MHA-L29 using Tapatalk
Click to expand...
Click to collapse
Awesome info. Thanks so much to both of you. I still haven't had any free time to mess with it, but I will this weekend.
xtermmin said:
EDIT2:
Something to try:
Stick your Verizon SIM into Slot1, leave Slot2 empty. Go into that 4636 menu and constantly switch between "LTE/GSM/CDMA auto", "LTE/CDMA auto", and "LTE-only". At some point (there's no set amount of tries) the phone will reset its modem state partitions, and should re-connect back to Verizon. Once it does, select "LTE/GSM/CDMA auto" and pop your TMO SIM into Slot2.
Click to expand...
Click to collapse
I took a ton of flipping back and forth, but finally got LTE working with your trick. I switched it back to LATE/GSM/CDMA auto, but it still says "missing or error" for the TMO SIM in slot 2.
I have same problem, any one has a solution?
CuDem said:
I have same problem, any one has a solution?
Click to expand...
Click to collapse
I had to RMA my phone.
Hi
OP5 suport (like OP3T) to be 1 sim on 4G (data) and second sim on 3G (voice) ???
post screenshot with sim configuration
thanks
I can only set the data sim to 2G/3G/4G but the second one is only 2G/3G (only need 2G but can not set it).
Klanac89 said:
I can only set the data sim to 2G/3G/4G but the second one is only 2G/3G (only need 2G but can not set it).
Click to expand...
Click to collapse
thanks
my second sim carrier only support 3G (voice and data - band 2100) and 4G (only data)
and from what you tell me it can work
on other dual-sim phones second sim can be only 2G
Where you from? 3G is quadband, so it will work, just maybe not in the USA.
aoprea said:
Hi
OP5 suport (like OP3T) to be 1 sim on 4G (data) and second sim on 3G (voice) ???
post screenshot with sim configuration
thanks
Click to expand...
Click to collapse
Only one SIM can be set as the active Data SIM at any one time. The other SIM can still work over UMTS ("3G"), so the OP3/3T/5 are not affected by AT&T's 2G Sunset. You can still get the calls/text over UMTS.
aenews said:
Only one SIM can be set as the active Data SIM at any one time. The other SIM can still work over UMTS ("3G"), so the OP3/3T/5 are not affected by AT&T's 2G Sunset. You can still get the calls/text over UMTS.
Click to expand...
Click to collapse
If I understand you correctly, the data SIM is software selectable. This would allow me to switch between the SIM cards based on 4g availability.
PS Other posters seem to indicate that only the SIM in the first position can be used to access 4g.
Explore3 said:
If I understand you correctly, the data SIM is software selectable. This would allow me to switch between the SIM cards based on 4g availability.
PS Other posters seem to indicate that only the SIM in the first position can be used to access 4g.
Click to expand...
Click to collapse
Yes. On the 3/3T there was even a toggle in the notification/status bar to switch the Data SIM immediately without needing to head to Settings.
Could someone please confirm with a screenshot showing that the second SIM on the OP5 supports 3G while the first SIM is using 4G or 3G?