Related
Hi guys ,i hope u can help me with this..
recently i just got the grand 2 like 2 months ago...when i tried to activate mobile data (of sim1) i had a problem ,it's not working,
I tried to trouble shoot the problem by changed apn's and stuff like that with the cust service,,nothing,
however,when i remove the 2nd sim the data of the sim1 ( which i want to activate) starts working ,I always make sure that sim1 os on wcdma and sim 2 mode is on gsm...i had sim 2 as clipped micro sim,however went to store and got a brand new micro sim to see if the clipped one was the problem ,nothing changed ,also swapped their position and placed sim1 in place of sim 2 and voice versa ,nothing happened same problem ,,,I also sometimes get a message saying:
the mobile network will be unavailable until you restart with a valid sim card inserted ,,and only the restart button available and u can't override it by pressing home key or anything so restarting in this case would be mandatory ,,that's why i chaned the 2nd sim card but nothing happened.
now i still can't get mobile data on my neww phone from sim1 and it's driving me crazy ,i think it's a software issue but am not sure cuz when i go to sim card manager and change the data service network to sim2 then put it back on sim1 ,some times the H+ appears and it works ,but not always and not for a long time,,,,,so the problem is between mobile data and dual sim functionality ,do u have this as a common issue ???,,please help
again ts steps i made:
1-re positioned sims in place of each other.
2-changed sim2 into an original micro sim instead of the clipped one i used to have.
3-i reset phone to factory defaults but same problem appeared
nero007 said:
Hi guys ,i hope u can help me with this..
again ts steps i made:
1-re positioned sims in place of each other.
2-changed sim2 into an original micro sim instead of the clipped one i used to have.
3-i reset phone to factory defaults but same problem appeared
Click to expand...
Click to collapse
I think it is a hardware issue. take it to the service center and insist on getting the issue sorted out as they will try to fob you off with some excuse or other.
all the best
schubeir
Roaming
nero007 said:
Hi guys ,i hope u can help me with this..
recently i just got the grand 2 like 2 months ago...when i tried to activate mobile data (of sim1) i had a problem ,it's not working,
I tried to trouble shoot the problem by changed apn's and stuff like that with the cust service,,nothing,
however,when i remove the 2nd sim the data of the sim1 ( which i want to activate) starts working ,I always make sure that sim1 os on wcdma and sim 2 mode is on gsm...i had sim 2 as clipped micro sim,however went to store and got a brand new micro sim to see if the clipped one was the problem ,nothing changed ,also swapped their position and placed sim1 in place of sim 2 and voice versa ,nothing happened same problem ,,,I also sometimes get a message saying:
the mobile network will be unavailable until you restart with a valid sim card inserted ,,and only the restart button available and u can't override it by pressing home key or anything so restarting in this case would be mandatory ,,that's why i chaned the 2nd sim card but nothing happened.
now i still can't get mobile data on my neww phone from sim1 and it's driving me crazy ,i think it's a software issue but am not sure cuz when i go to sim card manager and change the data service network to sim2 then put it back on sim1 ,some times the H+ appears and it works ,but not always and not for a long time,,,,,so the problem is between mobile data and dual sim functionality ,do u have this as a common issue ???,,please help
again ts steps i made:
1-re positioned sims in place of each other.
2-changed sim2 into an original micro sim instead of the clipped one i used to have.
3-i reset phone to factory defaults but same problem appeared
Click to expand...
Click to collapse
Hi.
I was searching for a solution for exactly the same problem.
I have the same phone as you and I get this to work if I select the option to allow Roaming, even though I fix the network operator to my provider's network. Strange but it should work.
Leifur.
m too facing the same prob in my grand prime 4g... i bought dis sum 10-15 days ago... plz help me to solve dis... othrwise i hv to use it as a single sim... any suggstion...plz help
Sent from my SM-G531F using XDA Free mobile app
Here is the best solution: I faced the same problem and fixed it doing the following...
First restart your phone, when you do that you will see the sim configuration settings screen appears at the boot time and allows you to choose which sim card to use for the Data Service Network... it has three options
1. Sim1
2. Sim2
3. Data service is Off
the third option is active and set by default which is why my cellphone was not working internet and i changed it to Sim1, and it worked perfectly so you have to try it again and again by changing the sim card in their slot... hope that helps!
my 4g on this phone is stopped working and there is so much hang problem in this phone, don't buy it, I did factory reset so many times in this phone to remove my problems but they remained as it is. I am writing about samsung galaxy grand prime 4G phone, model G531.
hello frnd i hv problem with my g7102 is not connecting to internet i have tried everything like mobile hard reset apn setting flash new roms but still data connection wont turn on but wifi is working please help guys
The only solution is to fix the hardware
My samsung SMG- 7102 network problem.when i start the mobile data then network are automatically no service pls help me
There is also software based bug for network mode. I have personally experienced this i.e. network mode doesn’t change in reality even if I select 3g mode. So, to force your particular sim card to switch to 3g only mode, first deactivate/disable other sim card on Yureka from setting> sim cards menu. Then dial *#*#4636#*#* > phone information. Tap on Turn off radio button and wait until the button reads turn on radio. Select WCDMA only from dropdown menu above the button. Wait a few seconds. Now tap on Turn on Radio button. Your desired sim card will successfully connect to 3G network. Now go to settings and sim card option and activate the disabled sim card as well. You may need to manually search for network signal if no network is shown. Also you may need to restart the device. If in 3g mode, your phone doesn’t connect to internet, Go to apn setting to ensure correct apn is selected. Sometimes APN menu might not show any installed network settings, in such case, just restart the handset. All these network related issues will be hopefully solved in the next Yureka ota software/firmware update.
after you did this you need to reboot your device......
maheshbabu9999 said:
There is also software based bug for network mode. I have personally experienced this i.e. network mode doesn’t change in reality even if I select 3g mode. So, to force your particular sim card to switch to 3g only mode, first deactivate/disable other sim card on Yureka from setting> sim cards menu. Then dial *#*#4636#*#* > phone information. Tap on Turn off radio button and wait until the button reads turn on radio. Select WCDMA only from dropdown menu above the button. Wait a few seconds. Now tap on Turn on Radio button. Your desired sim card will successfully connect to 3G network. Now go to settings and sim card option and activate the disabled sim card as well. You may need to manually search for network signal if no network is shown. Also you may need to restart the device. If in 3g mode, your phone doesn’t connect to internet, Go to apn setting to ensure correct apn is selected. Sometimes APN menu might not show any installed network settings, in such case, just restart the handset. All these network related issues will be hopefully solved in the next Yureka ota software/firmware update.
after you did this you need to reboot your device......
Click to expand...
Click to collapse
It's not a question thread! Is it? This thing's already poted in forums and everyone knows it., but thanks. Please edit your Topic.
maheshbabu9999 said:
There is also software based bug for network mode. I have personally experienced this i.e. network mode doesn’t change in reality even if I select 3g mode. So, to force your particular sim card to switch to 3g only mode, first deactivate/disable other sim card on Yureka from setting> sim cards menu. Then dial *#*#4636#*#* > phone information. Tap on Turn off radio button and wait until the button reads turn on radio. Select WCDMA only from dropdown menu above the button. Wait a few seconds. Now tap on Turn on Radio button. Your desired sim card will successfully connect to 3G network. Now go to settings and sim card option and activate the disabled sim card as well. You may need to manually search for network signal if no network is shown. Also you may need to restart the device. If in 3g mode, your phone doesn’t connect to internet, Go to apn setting to ensure correct apn is selected. Sometimes APN menu might not show any installed network settings, in such case, just restart the handset. All these network related issues will be hopefully solved in the next Yureka ota software/firmware update.
after you did this you need to reboot your device......
Click to expand...
Click to collapse
Hi.....i tried the above step.....still i am unable to connect to the 3G network......it says...."Cant Connect to this network right now"....on manually selecting the network
maheshbabu9999 said:
.....to force your particular sim card to switch to 3g only mode, first deactivate/disable other sim card on Yureka from setting> sim cards menu. Then dial *#*#4636#*#* > phone information. Tap on Turn off radio button and wait until the button reads turn on radio. Select WCDMA only from dropdown menu above the button. Wait a few seconds. Now tap on Turn on Radio button. Your desired sim card will successfully connect to 3G network. Now go to settings and sim card option and activate the disabled sim card as well.......All these network related issues will be hopefully solved in the next Yureka ota software/firmware update.......
Click to expand...
Click to collapse
this seems to work for me. i didn't have to reboot anytime during the procedure.
but, if you were to reboot for any reason, this has to be repeated.
any permanent solution yet? here are the steps i took (in pics)....
m0han said:
this seems to work for me. i didn't have to reboot anytime during the procedure....
Click to expand...
Click to collapse
tried this after upgrading to cm12s. works there too. wonder why there is no permanent fix yet.
m0han said:
tried this after upgrading to cm12s. works there too. wonder why there is no permanent fix yet.
Click to expand...
Click to collapse
After updating to lollipop my phone doesnt show any networks.. Its actually detecting the simcards.. i manually tried to register on the network,but it failed.very rarely am getting the signal when i went upstairs.. pls help
---------- Post added at 04:06 PM ---------- Previous post was at 03:45 PM ----------
maheshbabu9999 said:
There is also software based bug for network mode. I have personally experienced this i.e. network mode doesn’t change in reality even if I select 3g mode. So, to force your particular sim card to switch to 3g only mode, first deactivate/disable other sim card on Yureka from setting> sim cards menu. Then dial *#*#4636#*#* > phone information. Tap on Turn off radio button and wait until the button reads turn on radio. Select WCDMA only from dropdown menu above the button. Wait a few seconds. Now tap on Turn on Radio button. Your desired sim card will successfully connect to 3G network. Now go to settings and sim card option and activate the disabled sim card as well. You may need to manually search for network signal if no network is shown. Also you may need to restart the device. If in 3g mode, your phone doesn’t connect to internet, Go to apn setting to ensure correct apn is selected. Sometimes APN menu might not show any installed network settings, in such case, just restart the handset. All these network related issues will be hopefully solved in the next Yureka ota software/firmware update.
after you did this you need to reboot your device......
Click to expand...
Click to collapse
by default it as on GSM only option.. i cant change it to other mods.. pls help
Thanxx a lotttt
I was dying to find a solution for this finaly found it.I thought it was some network issue and not a bug but due to this site I found it was bug and solved it awesome
Same Problem
I am also facing the same problem but when I am at home it shows emergency calls only and when I am out the network appears. It frequently comes and goes off. When I am inserting the my Uninor sim in other handset the network is working perfectly at home but it shows emergency calls only or no service in yurekha (upgraded).
Please I am waiting for the solution. Thanks in advance.
my yureka plus is went into emergency calls mode. i am able to receive calls and messages. i am unable to read messages and it is not allowing me to open calls or to open settings.
I tried the above procedure but it does not change to wcdma it remains on GSM only mode. What can I do further. Help needed.
In my yu I have problem that .. it is connected to mobile data but no internet in chrome etc browsers ... but the net connected during uding of Facebook. . Plz give me solution
i alreday try to *#*#4636#*#*
but still i am facing same problem when i go outside my home i got network but inside home emrgency call
and i have idea airtel sim other both sim working and some time flightmode automatically . heating issue and 10hrs charging time
few days ago i have problem restarting i submit my phone yu store for repairing after reparing i am facing these kind of problem.
so please help me qucikly .
network
I also tried the above procedure but it does not working. My Dolphin sim card is working correctly but I have airtel 4g sim card. Only show sim card not connect any 2g, 3g, 4g network. Same problem are in any sim card. Please help me.
my yu yureka is not catching wifi signal there is poor wifi connection and in other devices signal are strongand in yu yureka its weak
N'ayam Amarsh'e said:
It's not a question thread! Is it? This thing's already poted in forums and everyone knows it., but thanks. Please edit your Topic.
Click to expand...
Click to collapse
hiiii
i have yureka mobile...
i tried as u said .but in my mobile after entering *#*#4636#*#* my already with turn on mode only. if i try to off that its not happening ..
so please give me the solution for this.
If u have any software for this or any other process please tell me friend i will solve my problem.....
please tell me the answer here or u can mail me at ([email protected])........thank u ..
yu yuphoria
my phone is not able to detect any operator. it is showing like "no service- operator". example my operator is reliance. it is showing "no service- reliance". I tried all possible known ways like searching for network manually n also method like going to *#*#4636#*#* n all... but there is no change in it. can anyone please help me to get out of this.
I tried resetting phone also. but no result.
please help me.
I have dual 4g phone. But when i select wcdma only for 1st sim. Second sim doesnt get range. It gets range only if i select gsm only on first sim
Hi
In my yureka mobile, Sim 1 is suddenly getting disconnected and not detected. I tried to swap the sims then again the problem persist with same sim but not the sim1 slot. I am using the mobile with same sim cards from more than 20 months. But this peculiar issue started occurring from last week. Again the sim is getting detected only after restarting the mobile. I am facing this issue more than 10 times a day. Can you please provide me the resolution.
Bhaskarabg said:
Hi
In my yureka mobile, Sim 1 is suddenly getting disconnected and not detected. I tried to swap the sims then again the problem persist with same sim but not the sim1 slot. I am using the mobile with same sim cards from more than 20 months. But this peculiar issue started occurring from last week. Again the sim is getting detected only after restarting the mobile. I am facing this issue more than 10 times a day. Can you please provide me the resolution.
Click to expand...
Click to collapse
Same problem.. Have u got any solutiom
Have tried *#*#4636#*#* no use at all, Still no signal
after flashing cm12.1 my phone stopped getting network..... i have tried every possible way to fix it( APN, network selection, powering off, deactivating- activating, *#*#4636#*#*, etc....)
Please Help its urgent:crying::crying::crying::crying:
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.
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.
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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?
Anybody facing network issues in a51? Sometimes i lost the internet completely. I have tried different sim cards, edited APN, formatted same problem. I can't sort out the issue is from phone or network provider. How can sort out the issue with phone or sim card? Pls help, so that i can return my phone.
nithambu said:
network issues
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Hello. I have the problem occurred when there were two SIM cards in the phone and the Internet was from the second SIM card. if leave one SIM card in the first slot and the second remove the problem disappeared. It was found out that this depended not on the phone but on the specific SIM card and its firmware. what may have a you problem can not tell. im said that he knew. thx.
Apparently from the tests performed, it is a problem in the LTE mode, since I switched to UMTS (3G), I no longer had connectivity problems. I hope that the problem can be corrected by Samsung, in a next update.
PS: Needless to say, I stopped having 4G communications !!!
Is or was your problem in any way similar to mine?
https://forum.xda-developers.com/galaxy-a51/help/samsung-a51-disconnects-cellular-network-t4160527