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..
my mi a1 signal strength is very low.drop frequently from 4g network to 3g or even in 3g network have low strength and voice call doesn't have proper quality.i compare a1 with my other phone in the same room and the other phone doesn't have this problem for example if a1 have 10-11 asu signal in 3g network the other phone have 15 16 asu signal strength.so my questions:
1-anybody else have the same problem and if there is a solution for that
2-this kind of problems can be fix by software update or is hardware problem and something related to design and material of the phone and can't be fix by update?
My problem is Same
Same problem in my phone after december update no improvment
mine never have any network 4G or 3G issue.. it's working fine indoor an outdoor
m.i.89 said:
my mi a1 signal strength is very low.drop frequently from 4g network to 3g or even in 3g network have low strength and voice call doesn't have proper quality.i compare a1 with my other phone in the same room and the other phone doesn't have this problem for example if a1 have 10-11 asu signal in 3g network the other phone have 15 16 asu signal strength.so my questions:
1-anybody else have the same problem and if there is a solution for that
2-this kind of problems can be fix by software update or is hardware problem and something related to design and material of the phone and can't be fix by update?
Click to expand...
Click to collapse
Try putting the SIM in the second slot.
Worked for me....
I got a network issue too and 2nd sim doesn't stay to 2g only if 1st is selected as data. Consuming most of battery due to this. This happened after the first update. Please check of anyone else too has this :/
yanleites said:
Try putting the SIM in the second slot.
Worked for me....
Click to expand...
Click to collapse
i think maybe a little bit better but the problem didn't go away.i compare every network,in 4g and 2g network a1 behind other phones but in 3g network has good signal
does anyone know if this kind of problem can be fix by software update or it's a problem with hardware or design (maybe unibody design blocking signal)of the phone?
prannoytambe said:
I got a network issue too and 2nd sim doesn't stay to 2g only if 1st is selected as data. Consuming most of battery due to this. This happened after the first update. Please check of anyone else too has this :/
Click to expand...
Click to collapse
i didn't understand what was the problem exactly but in my phone you can select one of two sim for data and the sim select for data automatically change to 4g/3g and the other sim will go to 2g only. if you have two sim active it's normal to drain battery a little more but i can't complain about the battery i think it's good overall
m.i.89 said:
i didn't understand what was the problem exactly but in my phone you can select one of two sim for data and the sim select for data automatically change to 4g/3g and the other sim will go to 2g only. if you have two sim active it's normal to drain battery a little more but i can't complain about the battery i think it's good overall
Click to expand...
Click to collapse
My secondary sim finds 3g or 4g signal even it should stay on 2g only
prannoytambe said:
My secondary sim finds 3g or 4g signal even it should stay on 2g only
Click to expand...
Click to collapse
my secondary sim can find 2g or 3g network but no 4g.4g only available to data sim.maybe VoLTE call can be the reason?(my carrier doesn't support VoLTE call)
try this:data sim in 4g ok.the other sim is for call only.dial *#*#4636#*#* then go to phone information set preferred network type to GSM only
m.i.89 said:
my secondary sim can find 2g or 3g network but no 4g.4g only available to data sim.maybe VoLTE call can be the reason?(my carrier doesn't support VoLTE call)
try this:data sim in 4g ok.the other sim is for call only.dial *#*#4636#*#* then go to phone information set preferred network type to GSM only
Click to expand...
Click to collapse
This changed the primary sim to 2g and for 5 min secondary sim found 2g and again it was on 3g. I have weak network for 3g 4g at my place, due to phone switching to 3g 4g I get higher battery drain. My old phone kept my secondary sim to 2g only. I think A1 has issue keeping phone to 2g only
prannoytambe said:
This changed the primary sim to 2g and for 5 min secondary sim found 2g and again it was on 3g. I have weak network for 3g 4g at my place, due to phone switching to 3g 4g I get higher battery drain. My old phone kept my secondary sim to 2g only. I think A1 has issue keeping phone to 2g only
Click to expand...
Click to collapse
for me working.this 4636 menu will change the sim selected for call and SMS (you can select sim one or two for call and SMS) to 2g and the other sim(data sim) will not show in menu. I select that GSM option and several hours later still on GSM.but after that don't go in cellular network-->network operators and search for network maybe that can change setting to defualt.you can check if you are still in 2g mode in 4636 menu or in setting-->about phone-->Status-->SIM status
m.i.89 said:
for me working.this 4636 menu will change the sim selected for call and SMS (you can select sim one or two for call and SMS) to 2g and the other sim(data sim) will not show in menu. I select that GSM option and several hours later still on GSM.but after that don't go in cellular network-->network operators and search for network maybe that can change setting to defualt.you can check if you are still in 2g mode in 4636 menu or in setting-->about phone-->Status-->SIM status
Click to expand...
Click to collapse
Ok I got it , I don't use secondary sim for anything else then receiving the call. So i didn't make it default anywhere. After making it default to calls I could see the option in 4636 for secondary sim. So this solution doesn't work in my condition, I don't know why the just keep the secondary sim to 2g only . I have reported this couple of time but no changes. Hope they find this issue in Oreo update
For unknown reason, I can no longer get LTE after touching the Network Mode setting on my LG G6 (US997 carrier-independent model). The default mode on my G6 is "Global", and when I tried changing it to "LTE/GSM/UMTS" it surprisingly switched to 4G. So I changed it back to Global to get the LTE back, but it did not work. I tried switching the data On and Off, restarted the phone (several times), switching to Airplane mode and back. None of the above helped.
Have any of you having access to LTE (regardless of phone brand/model) experienced this?
I have also tried getting help from my phone carrier (AT&T) but the tech person cannot help fix the issue.
The only things I can think of now to possibly resolve this is to reset the phone and even get a new SIM card. But before trying these drastic actions and losing several days of backup/restoration/setup/tweaks, I wanted to get some expert advise from you guys.
The reason I tried messing up with the Network Mode is because I've read from somewhere that the Global mode tends to drain more battery (is this true in your experience?).
Thank you all in advance.
@sp_1st_timer what signal did you get now instead of LTE? By the way 4G is the same as LTE in terms of Band usage and speed. Did you tried starting your phone without sim cards and the then power off and restart with cards again?
strongst said:
@sp_1st_timer what signal did you get now instead of LTE? By the way 4G is the same as LTE in terms of Band usage and speed. Did you tried starting your phone without sim cards and the then power off and restart with cards again?
Click to expand...
Click to collapse
It says "4G" on the status bar from the moment I first touched the Network Mode setting. It used to say "LTE" next to the signal strength bars. Also, my internet connection speed used to be 58 Mbps under LTE. Now it's only 23 Mbps under that "4G" status. I would not care about what it says on the network type if the speed was just the same.
I'll try that restart without sim card and report back.
It did not fix the issue.
By the way, one reason I think replacing SIM card might help fix the issue is because I know the phone writes information to it (contacts, SMS, etc.) and I suspect the phone has overwritten something on the SIM that is related to the Network Mode. Please correct me if I'm wrong.
sp_1st_timer said:
It did not fix the issue.
By the way, one reason I think replacing SIM card might help fix the issue is because I know the phone writes information to it (contacts, SMS, etc.) and I suspect the phone has overwritten something on the SIM that is related to the Network Mode. Please correct me if I'm wrong.
Click to expand...
Click to collapse
The sim card has an memory for contacts, right. The sim card dies automatically after x registrations in carrier network and the authentication is done against HLR server of the carrier. And the sim is related to access a specific network, but that's only related if your sim is very old. Everything else is stored in HLR server of the carrier.
HI,
My redmi note 7 has a issue, when I put the Phone in GSM automatic he take 4g for a while but after some minutes it goes down to H+ or H (depends of the signal) and it dont take 4g again, it take 4g if I reset the signal or put airplane Mode for a moment. If I put LTE only in the settings it takes LTE and stay there normal, the speed test is normal for LTE but there is not LTE in everywhere and I lost the signal if there are not LTE. Why the Phone dont go 4G automatic when there are 4g?
Sorry for my english
I'd try changing the "preferred network type" under SETTINGS > NETWORK & INTERNET > MOBILE NETWORK (I'm on HavocOS, on your rom the path may differ)
The preferred network type is GSM/LTE