Database Users

Dual Sim not working. Only one sim works at a time

After making some changes in service menu, i am unable to use dual sim functionality. I can use only one sim slot at a time. The other one shows no network available. Regardless of which sim slot i use. In service menu sim slot 1 can be set to any preferred network but sim slot 2 is stuck in gsm only mode. Manually searched for network but no network available. Flashed latest oos 3.1.0,still the same issue. Can anyone help me with this.
Thanks in advance

Just restore whatever change you did in service menu and you should be back, you should not have played around in there from the beginning ?

pitrus- said:
Just restore whatever change you did in service menu and you should be back, you should not have played around in there from the beginning ?
Click to expand...
Click to collapse
Service menu doesn't have an option to reset to default and i don't remember exactly what changes i made. Yea i shouldn't have touched the service menu. If there's any thing else that can be done. Thanks for the quick reply

I think you changed radios to be only 3g/4g and your carriers uses the same band
Sent from my ONE A2005 using Tapatalk

fburgos said:
I think you changed radios to be only 3g/4g and your carriers uses the same band
Sent from my ONE A2005 using Tapatalk
Click to expand...
Click to collapse
I'm not sure what changes I've made but yes both providers use band 40 2300 mhz for lte. I've tried changing one of the sim to use only 2g so that both sims are on different band but still same issue.

If you are in an area where carrier uses exclusively LTE that's the problem, opt radio is dual standby it alternate between two signals in any of the combinations 2g-3g/lte but not 3g-3g or lte-lte
Sent from my ONE A2005 using Tapatalk

fburgos said:
If you are in an area where carrier uses exclusively LTE that's the problem, opt radio is dual standby it alternate between two signals in any of the combinations 2g-3g/lte but not 3g-3g or lte-lte
Sent from my ONE A2005 using Tapatalk
Click to expand...
Click to collapse
My phone was working fine few days ago. I messed up something in service menu, after that the problem started. I have set one of the sim to use 2g manually, still i can't find any signal and both carriers use 3 different bands.

Have you found any solution i am facing exact same issue after changing network band. please help

fburgos said:
I think you changed radios to be only 3g/4g and your carriers uses the same band
Sent from my ONE A2005 using Tapatalk
Click to expand...
Click to collapse
How to reset radio band i am facing same problem. I tried factory reset, restore old twrp EFS backup, clean flashing stock rom, flashing cm14.1. But problem is still there please help.

Finally......
Hello guys i solved this issue by flashing oxygen os 2.2.0 now my both sim are working fine.
Just flash oxygen os 2.2.0 which has dual SIM preference selection fix.

shan1990 said:
Finally......
Hello guys i solved this issue by flashing oxygen os 2.2.0 now my both sim are working fine.
Just flash oxygen os 2.2.0 which has dual SIM preference selection fix.
Click to expand...
Click to collapse
No wifi, no simcards detected...

Can you explain how it makes it work?

Here is a good read about such dual-sim issues (esp. posts #3,4):
https://forums.oneplus.net/threads/dua-sim-detection-problem-only-one-sim-being-detected.430976/

I'm a noob with this stuff, I read that forum and I'm still unclear... Is there a work around or am I screwed? Is it the phone/Software or my sim cards?

Here is the solution
In order to solve the problem go to service menu by dialing *#*#4636#*#* then turn off radio then select radio band 32 when it says successful, restart your phone and the problem will be solved
Say thanks at fb.com/suri131
You can contact for any other issue too

Finally solved the issue
I too faced similar issue and solved it now. I'll share my observations here.
I had 2 4g Sims Airtel and Jio. Jio for data. Both the sim's were working fine , once i went into roaming suddenly after that airtel stopped latching to network. Whatever sim slot i put my airtel sim it's not getting network if in the other slot Jio is there. I tried to use my airtel sim in other phones and it's working fine. I tried putting only airtel sim it's working fine in my OP2. I thought this may be imei problem and checked imei , my OP2 has both imei in it.
So now the fix part , for me 4g sim was working fine so tried fixing the other one in sim slot 1 i.e.. airtel.
*Install and open Shortcut Master(Lite).
*Menu->Search->Type "Engineering" -> Select "EngineerMode" from Search result (package name:com.android.engineeringmode.EngineeringMode) ->Launch.
*Click Network Set
*Click Sim Card Select -> sim 1
*Click Rat mode ->Select GSM only
*Click band mode->Select PGSM 900/1800
Now turn on Airplane mode on /off wait for a minute you should see both network.
Summary: In OP2 one slot will be 4g / other will be GSM 2g... So whichever sim is working for you don't change settings for that sim , play with the other sim for which no network is coming.

Abidbhat said:
Finally solved the issue
I too faced similar issue and solved it now. I'll share my observations here.
I had 2 4g Sims Airtel and Jio. Jio for data. Both the sim's were working fine , once i went into roaming suddenly after that airtel stopped latching to network. Whatever sim slot i put my airtel sim it's not getting network if in the other slot Jio is there. I tried to use my airtel sim in other phones and it's working fine. I tried putting only airtel sim it's working fine in my OP2. I thought this may be imei problem and checked imei , my OP2 has both imei in it.
So now the fix part , for me 4g sim was working fine so tried fixing the other one in sim slot 1 i.e.. airtel.
*Install and open Shortcut Master(Lite).
*Menu->Search->Type "Engineering" -> Select "EngineerMode" from Search result (package name:com.android.engineeringmode.EngineeringMode) ->Launch.
*Click Network Set
*Click Sim Card Select -> sim 1
*Click Rat mode ->Select GSM only
*Click band mode->Select PGSM 900/1800
Now turn on Airplane mode on /off wait for a minute you should see both network.
Summary: In OP2 one slot will be 4g / other will be GSM 2g... So whichever sim is working for you don't change settings for that sim , play with the other sim for which no network is coming.
Click to expand...
Click to collapse
it worked instantly

Abidbhat said:
Finally solved the issue
I too faced similar issue and solved it now. I'll share my observations here.
I had 2 4g Sims Airtel and Jio. Jio for data. Both the sim's were working fine , once i went into roaming suddenly after that airtel stopped latching to network. Whatever sim slot i put my airtel sim it's not getting network if in the other slot Jio is there. I tried to use my airtel sim in other phones and it's working fine. I tried putting only airtel sim it's working fine in my OP2. I thought this may be imei problem and checked imei , my OP2 has both imei in it.
So now the fix part , for me 4g sim was working fine so tried fixing the other one in sim slot 1 i.e.. airtel.
*Install and open Shortcut Master(Lite).
*Menu->Search->Type "Engineering" -> Select "EngineerMode" from Search result (package name:com.android.engineeringmode.EngineeringMode) ->Launch.
*Click Network Set
*Click Sim Card Select -> sim 1
*Click Rat mode ->Select GSM only
*Click band mode->Select PGSM 900/1800
Now turn on Airplane mode on /off wait for a minute you should see both network.
Summary: In OP2 one slot will be 4g / other will be GSM 2g... So whichever sim is working for you don't change settings for that sim , play with the other sim for which no network is coming.
Click to expand...
Click to collapse
Hey man. Installed a custom based on android 12 and i'm not sure what happened but only one sim card was working. Used msm tool to go back to oos 12 and now only one sim card shows.
Was going to try your method but the "engineeringmode" does not show up in search.
Any suggestions?

Need Help!!! (JIO)

Running stock rom with volte support enabled (non-rooted, XT1562)
Sim 1 :- Jio
Sim 2 :- Idea
When switching the mobile data from JIO to Idea, Cellular data of idea works correctly with 4g but the network of jio dies...
When i swtich it back to jio i get full tower of jio....
Help Please....
Thanks in Advance

MotoXPlay said:
Running stock rom with volte support enabled (non-rooted, XT1562)
Sim 1 :- Jio
Sim 2 :- Idea
When switching the mobile data from JIO to Idea, Cellular data of idea works correctly with 4g but the network of jio dies...
When i swtich it back to jio i get full tower of jio....
Help Please....
Thanks in Advance
Click to expand...
Click to collapse
That's expected because JIO is a 4G only Mobile service.
Any Dual SIM device can have High Speed Network on any 1 of the 2 SIM slots and the other one will always remain on 2G. So whenever you are enabling 4G on Idea's SIM Slot, JIO's SIM Slot is being changed to 2G only and JIO can't receive a Signal in 2G mode. I am not sure but I have heard that in few Cities in South India JIO has partnered with BSNL to use it's(BSNL) network on 2G mode but I don't see how it's gonna work or even if it's true or just a rumer.
So, if you want to use JIO you need to have 4G enabled in it's SIM slot and make another one 2G.
Hope I was able to make your confusion clear. Feel free to ask back if you have any more questions.

arnabJ said:
That's expected because JIO is a 4G only Mobile service.
Any Dual SIM device can have High Speed Network on any 1 of the 2 SIM slots and the other one will always remain on 2G. So whenever you are enabling 4G on Idea's SIM Slot, JIO's SIM Slot is being changed to 2G only and JIO can't receive a Signal in 2G mode. I am not sure but I have heard that in few Cities in South India JIO has partnered with BSNL to use it's(BSNL) network on 2G mode but I don't see how it's gonna work or even if it's true or just a rumer.
So, if you want to use JIO you need to have 4G enabled in it's SIM slot and make another one 2G.
Hope I was able to make your confusion clear. Feel free to ask back if you have any more questions.
Click to expand...
Click to collapse
Ty Sir! That cleared my confusion

MotoXPlay said:
Ty Sir! That cleared my confusion
Click to expand...
Click to collapse
Happy to be of help.
Sent from my Motorola Moto X Play using XDA Labs

Only one sim works out of the two!?

I have an OP2 OOS Version 3.5.6. My two sim slots are also filled up with two sims. So the Problem here is Only one of the Sim works at a time. Suppose if i keep the PREFERED SIM FOR MOBILE DATA as SIM 1 , the network of SIM 2 goes off and only SIM 1 is active.Vice versa . Please help me and as far as i remember i did not configure any unneccesary things. I am just noobin these stuff.TIA

Network???
May I know network an d country????

[email protected] said:
May I know network an d country????
Click to expand...
Click to collapse
In the SIM 1 the Network is JIO 4G and in the SIM 2 the network is Vodafone 4G. The country is INDIA

Same happens on lgv20 but it works fine on s7
Sent from my LG-H990 using Tapatalk

khankareem said:
In the SIM 1 the Network is JIO 4G and in the SIM 2 the network is Vodafone 4G. The country is INDIA
Click to expand...
Click to collapse
You can't use two 4G SIMs at the same time.
The SIM not set as the primary (data) SIM can only connect to a 2G network.
It's always been like this on the OP2

Spannaa said:
You can't use two 4G SIMs at the same time.
The SIM not set as the primary (data) SIM can only connect to a 2G network.
It's always been like this on the OP2
Click to expand...
Click to collapse
I mean't to say that Vodafone is 4G enabled Sim. It is not mandatory that it should work only on 4G.
Whereas JIO is a Network Where 4G is Mandatory. BTW it was working fine for the past three months without any issue.
And I even tried Having Airtel as the 1st Sim and Vodafone as the 2nd sim (Vice Versa) it doesn't work..
I thought if i Factory Reset the phone the problem would be gone, but it didn't ! Probably i have to go to a Service Centre

khankareem said:
I mean't to say that Vodafone is 4G enabled Sim. It is not mandatory that it should work only on 4G.
Whereas JIO is a Network Where 4G is Mandatory. BTW it was working fine for the past three months without any issue.
And I even tried Having Airtel as the 1st Sim and Vodafone as the 2nd sim (Vice Versa) it doesn't work..
I thought if i Factory Reset the phone the problem would be gone, but it didn't ! Probably i have to go to a Service Centre
Click to expand...
Click to collapse
If your JIO SIM is the primary SIM and Vodafone have a 2G network in your location, the second SIM should be able to connect too.
If it doesn't, something isn't right.

Spannaa said:
If your JIO SIM is the primary SIM and Vodafone have a 2G network in your location, the second SIM should be able to connect too.
If it doesn't, something isn't right.
Click to expand...
Click to collapse
Hope Going to the Service Center Should solve my Issue.

SIM Slot 2 - No Network

Hi Everybody,
I am stuck with my OP2 OOS 3.5.6.
So after i got the 3.5.6 i was not able to get VOLTE. So i found a resolution on the OP2 forum:
They advised to downgrade to 3.1.0 and then to upgrade to 3.5.6, did that and was able to get VOLTE, but another issue started, as in India Jio is a 4g service and I read somewhere that we will have to use it in SLOT 1 , so i did the same, and Vodafone in SLOT 2.
When i did that Jio works fine but there is no network for Vodafone.
After that i have tried the following:
*Selecting network manually.
*Changing the band.
*Reinstalling the OS.
*Resetting the network settings.
*Wiping out data and cache.
Nothing worked for me, can somebody suggest me something.

Rootleopard said:
Hi Everybody,
I am stuck with my OP2 OOS 3.5.6.
So after i got the 3.5.6 i was not able to get VOLTE. So i found a resolution on the OP2 forum:
They advised to downgrade to 3.1.0 and then to upgrade to 3.5.6, did that and was able to get VOLTE, but another issue started, as in India Jio is a 4g service and I read somewhere that we will have to use it in SLOT 1 , so i did the same, and Vodafone in SLOT 2.
When i did that Jio works fine but there is no network for Vodafone.
After that i have tried the following:
*Selecting network manually.
*Changing the band.
*Reinstalling the OS.
*Resetting the network settings.
*Wiping out data and cache.
Nothing worked for me, can somebody suggest me something.
Click to expand...
Click to collapse
If you remove the Jio SIM and leave the Vodafone SIM in slot 2 does it connect to the network?
Does the Vodafone network support 2g?

Spannaa said:
If you remove the Jio SIM and leave the Vodafone SIM in slot 2 does it connect to the network?
Does the Vodafone network support 2g?
Click to expand...
Click to collapse
Nope, even if I remove the Jio Sim and just have the Vodafone Sim in the second slot still it does not show up.

Rootleopard said:
Nope, even if I remove the Jio Sim and just have the Vodafone Sim in the second slot still it does not show up.
Click to expand...
Click to collapse
You only answered one question!
Does the Vodafone network support 2g?
Does the Vodafone sim work in slot 1?
Does your SIM 2 have an IMEI in settings > about phone > status IMEI info?

Spannaa said:
You only answered one question!
Does the Vodafone network support 2g?
Does the Vodafone sim work in slot 1?
Does your SIM 2 have an IMEI in settings > about phone > status IMEI info?
Click to expand...
Click to collapse
Yes Vodafone does support 2g but when I select 2g and the Sim in the slot 2 it does not work.
Yes the Vodafone does work fine with 3g and 2g network in slot 1.
Yes the Sim 2 does show the imei number under settings.

You can select vodafone in slot 1 with 2g then put jio in slot 2 and select 4g as the 1+2 has dual LTE standby so jio should work fine on slot 2

ItsmYarD said:
You can select vodafone in slot 1 with 2g then put jio in slot 2 and select 4g as the 1+2 has dual LTE standby so jio should work fine on slot 2
Click to expand...
Click to collapse
Does really op2 has dual stand by, as I am not able to get volte and I have the Jio in slot 2.
Also I contacted op2 customer care and they mentioned that it will only support one 4g and other will be only 3g.
Does it work for you if yes can you please let me know what are the settings you have.

Rootleopard said:
Does really op2 has dual stand by, as I am not able to get volte and I have the Jio in slot 2.
Also I contacted op2 customer care and they mentioned that it will only support one 4g and other will be only 3g.
Does it work for you if yes can you please let me know what are the settings you have.
Click to expand...
Click to collapse
Dual sim standby works fine for me but I'm not a Jio user.
OnePlus support are wrong, If your data sim is 4g, the other drops to 2g not 3g.
Not sure what your issue is though as I've only heard of it affecting some (but not all) Jio users.

Spannaa said:
Dual sim standby works fine for me but I'm not a Jio user.
OnePlus support are wrong, If your data sim is 4g, the other drops to 2g not 3g.
Not sure what your issue is though as I've only heard of it affecting some (but not all) Jio users.
Click to expand...
Click to collapse
You both are right they did mention 2g,my mistake that I mentioned 4g.
Yes I got a few users who mentioned the same of not getting network in the second slot. I did got a hint from somebody that it might be an issue with the update and a fix is in the pipeline. But again its just a hint and not sure.
Thanks a lot for all the help.

[HELP] Can't make calls on Slot1 after oreo (Data, Msg's work)

Hi Everyone,
I've been having this issue since a week or so(after oreo). I can't make make calls if i put my Idea 4g sim on slot1. Internet and messages works fine. No issues on slot2. Will appreciate any help thanks

jashd7 said:
Hi Everyone,
I've been having this issue since a week or so(after oreo). I can't make make calls if i put my Idea 4g sim on slot1. Internet and messages works fine. No issues on slot2. Will appreciate any help thanks
Click to expand...
Click to collapse
There could be 3 possible ways.
1) Software bug
2) sim slot pin breakage
3) sim card chip problem
Identify the root cause at first.

hemanth_gunasekaran said:
There could be 3 possible ways.
1) Software bug
2) sim slot pin breakage
3) sim card chip problem
Identify the root cause at first.
Click to expand...
Click to collapse
2nd and 3rd not possible. Since data and messages are working.
Can you provide more information.
Are you on 4g network.
What type of error do you get.
Your circle.
Have you changed your network settings using *#*#4636#*#*?
Have you tried calling using 3g and 2g only?
If not choose WCDMA only (use above code). Also try with GSM only.
!dea user here since a long time(familiar with all their problems and solutions)
Please answer above all questions in as much details as you can.
Please keep in mind that it can be an software bug

alkesh95 said:
2nd and 3rd not possible. Since data and messages are working.
Can you provide more information.
Are you on 4g network.
What type of error do you get.
Your circle.
Have you changed your network settings using *#*#4636#*#*?
Have you tried calling using 3g and 2g only?
If not choose WCDMA only (use above code). Also try with GSM only.
!dea user here since a long time(familiar with all their problems and solutions)
Please answer above all questions in as much details as you can.
Please keep in mind that it can be an software bug
Click to expand...
Click to collapse
Thanks for the reply man really appreciate it
Problem solved after i used Airtel SIM in that same slot for some time. Now my idea sim is working again. Thankx

Hey.... i have same problem.....i tried 2 different airtel sim .....they are working
alkesh95 said:
2nd and 3rd not possible. Since data and messages are working.
Can you provide more information.
Are you on 4g network.
What type of error do you get.
Your circle.
Have you changed your network settings using *#*#4636#*#*?
Have you tried calling using 3g and 2g only?
If not choose WCDMA only (use above code). Also try with GSM only.
!dea user here since a long time(familiar with all their problems and solutions)
Please answer above all questions in as much details as you can.
Please keep in mind that it can be an software bug
Click to expand...
Click to collapse
Hey.... i have same problem.....i tried 2 different airtel sim .....they are working fine in sim slot 2 but having problem in making outgoing calls while placed in sim slot 1. Data network and messages working fine but no outgoing calls.
As u told about *#*#4636#*#* its shows UTMS in voice network
Please help.....sim company saying it handset problem and handset company saying it sim problem.......... my handset is xiomi redmi note 4

My sim is working but I am not messages and calls are not working.
i have updated my mi a1 in pie. now i am not able to use calling and messaging.

kk2150 said:
i have updated my mi a1 in pie. now i am not able to use calling and messaging.
Click to expand...
Click to collapse
Same problem here. Solution for now is to change to 2G network, at least for me. When I try to call with 4G preferred sometimes it work, but when it works they can't hear me and I have to scream. This Pie update have so many bugs it is ridiculous. I can't believe they put such ****ty update to the masses it seems like BETA version. In Oreo when making call phone switches from 4G to 3G instantly now in Pie switches worry slow if it even switch and the signal is so bad that the call drops and that is in places where the signal is perfect

Hi, since last 4 days i am facing same ptoblem cellular SIM in slot 1 not working for incoming and outgoing calls and outgoing sms but internet and sms service (invoming) is working perfect on 4G
When i switch it to 3G/2G it shows no signals
But when i inserted this same sim in slot 2 all things work perfect. same problem occurred even when i inserted other network sim in slot 1 (internet and sms(incoming) worked but unable to do calls) I had factory reset but problem not solved
I am using poco x3 nfc
I anyone have solution plz tell me