Moto X Play dual SIM. Both SIMs are original (not cut) nano SIMs from two different GSM operators. The phone is not rooted, flashed / reflashed, everything is stock. Both signals bars are full but I am unable to make outgoing calls. I dial a number but no any sound coming from the earpiece - no tones or other party’s voice, nothing, just absolute silence. After some time I hear short “beep”, the line is automatically disconnected and the phone returns to standby. Same happens for both SIMs. I can temporary fix that problem by the phone OFF / ON and then it is possible to make calls. As far as I understand during OFF / ON the phone signs-out / signs-in into GSM networks and that fixes the problem. But after some time it returns again. I several times cleared cache partition and made one hard reset via Settings > Backup & Reset > Factory Data Reset. But that did not help. I also tried various settings for Preferred Network Type (4G, 3G) but that did not help as well.
Please assist.
Sirob said:
Moto X Play dual SIM. Both SIMs are original (not cut) nano SIMs from two different GSM operators. The phone is not rooted, flashed / reflashed, everything is stock. Both signals bars are full but I am unable to make outgoing calls. I dial a number but no any sound coming from the earpiece - no tones or other party’s voice, nothing, just absolute silence. After some time I hear short “beep”, the line is automatically disconnected and the phone returns to standby. Same happens for both SIMs. I can temporary fix that problem by the phone OFF / ON and then it is possible to make calls. As far as I understand during OFF / ON the phone signs-out / signs-in into GSM networks and that fixes the problem. But after some time it returns again. I several times cleared cache partition and made one hard reset via Settings > Backup & Reset > Factory Data Reset. But that did not help. I also tried various settings for Preferred Network Type (4G, 3G) but that did not help as well.
Please assist.
Click to expand...
Click to collapse
Looks like a hardware defect
any news? ?
Sirob said:
Moto X Play dual SIM. Both SIMs are original (not cut) nano SIMs from two different GSM operators. The phone is not rooted, flashed / reflashed, everything is stock.
Please assist.
Click to expand...
Click to collapse
try this
forum.xda-developers.com/moto-x-play/help/network-band-changed-to-usa-t3278614
Thank everybody. Trying to fix “unable to call” problem I was playing with various settings in *#*#4636#*#* menu and did the same mistake as in bablu048's link - I clicked USA band and had no network on SIM 1 (( Having checked I found only one solution – to reflash original ROM. Since I was unable to reflash myself I yesterday gave the phone to service shop and it is now not with me. Once the shop do not fix my phone I shall follow bablu048 advice and let you know the outcome.
I got the phone from the service and it is now working well. They did not tell me what they did, just took the money So, I do not know whether they reflashed complete official ROM of the radio only or somehow reset the radio etc. But GSM network on SIM 1 is back and no "unable to call" problem so far. Once I am again unable to call I will try what bablu048 suggested
Unfortunately "unable to call" is back I shall try bablu048 advice as soon as I can but once somebody have any other suggestions please advise ASAP.
Have you tried with 1 sim card only?
Sent from my XT1562 using XDA-Developers mobile app
No, I have not tried with one SIM only. Actually, that problem is intermittent and it is quite difficult to troubleshoot it. What seems to me is that I am usually unable to make calls when GSM mobile data is turned ON. At least, I cannot recall that I was unable to call when I was in the office or home where Wi-Fi was available.
Is that possible that 3G GSM data somehow prevents voice calls?
Troubleshooting the issue I noticed the following: "unable to call" problem is here when SIM 1 is used for mobile data. If I set SIM 2 as preferred SIM for mobile data the problem disappears. Before I always used SIM 1 for mobile data and faced the problem quite often. But after I turned mobile data on SIM 1 OFF and switched it ON on SIM 2 the phone is OK. Does anybody have an idea why this may happen? Can it be SIM 1 operator-related issue? Can something be wrong with the SIM card itself? Or there is a problem with the device software or hardware?
Sorry to inundate you with messages but I came across exactly the same situation on a Meizu forum. One user there was also unable to make / receive voice calls on two Meizu phones if he enables mobile data on SIM No. 1.
His first post was:
Hello guys. I am using a Meizu MX5 with 4.5.2.7A firmware. My carrier is Orange Romania and I have a problem.
Whenever I activate my data, especially 4G after about 30-45 minutes or so I cannot make/receive a phone call. When I try to place a call the phone sits in the dialing screen without any response, and when I try to call my phone it says that the client cannot be reached. The other functions of the phone work just fine during this time.
To resolve this issue I have to turn the mobile data off and wait for about 15 minutes, or reset the device.
And finally he found the following solution:
Well after a few days with “testing” it appears that (with your help) I have solved the problem.
When you use two SIM cards on your phone, it would be best if the main SIM (voice + data) would be used in the SIM 2 slot because the problems did not appear again. The 1’st SIM slot appears to be able only to handle calls, without data, at the same time. A bit weird if you ask me, but hey…
I was able to keep my data on for days and could place calls or send SMS just fine without any trouble. Swapped SIM cards in my father’s phone also, and the problem disappeared.
So, it seems that SIM slot No. 1 of my Moto X Play is also unable to provide both voice and data. Any idea how to fix that?
Sirob said:
Moto X Play dual SIM. Both SIMs are original (not cut) nano SIMs from two different GSM operators. The phone is not rooted, flashed / reflashed, everything is stock. Both signals bars are full but I am unable to make outgoing calls. I dial a number but no any sound coming from the earpiece - no tones or other party’s voice, nothing, just absolute silence. After some time I hear short “beep”, the line is automatically disconnected and the phone returns to standby. Same happens for both SIMs. I can temporary fix that problem by the phone OFF / ON and then it is possible to make calls. As far as I understand during OFF / ON the phone signs-out / signs-in into GSM networks and that fixes the problem. But after some time it returns again. I several times cleared cache partition and made one hard reset via Settings > Backup & Reset > Factory Data Reset. But that did not help. I also tried various settings for Preferred Network Type (4G, 3G) but that did not help as well.
Please assist.
Click to expand...
Click to collapse
If you have unlocked bootloader try these codes
fastboot erase modemst1
fastboot erase modemst2
fastboot erase cache
fastboot reboot
hope it works
The problem continues and I have some update: I have two SIMs, one SIM from Operator 1 and another from Operator 2. If I enable data on SIM from Operator 1 everything is OK with voice and data. And if I go to *#*#4636#*#* in Phone info I see “preferred network type LTE/GSM Auto (PRL)”.
But when I enable data on SIM from Operator 2 after some time I cannot make phone calls as I described earlier. And if I go to *#*#4636#*#* in Phone info I see “preferred network type GSM Only”. And I am unable to manually change that “GSM Only” to “LTE/GSM Auto (PRL)”. It always stays “GSM Only” and does not change.
However Operator 2 is similar to Operator 1, it is also a 3G operator.
Why preferred network type for Operator 1 is displayed as “LTE/GSM Auto (PRL)” but for Operator 2 “GSM Only”?
And why for Operator 2 I cannot change “GSM Only” to “LTE/GSM Auto (PRL)”? Why it is stuck to “GSM Only” when data is enabled on SIM from Operator 2?
More updates… Yesterday (when preferred network type of Operator 2 was “GSM Only” and I was unable to change that type) SIM of Operator 2 was in slot no 2. Today I swapped SIM cards – I fitted SIM of Operator 2 in slot no 1 and SIM of Operator 1 in slot no 2. And now all is OK with preferred network type for Operator 2 – it is displayed as “LTE/GSM Auto (PRL)”. So it seems that network type for slot no 2 of Moto X Play dual SIM can only be “GSM Only” and it is impossible to change it.
Any comments?
Related
I bought unlocked, sim free HD2 inserted the sim of my usual Mobilink network the phone wizards automatically configured the setttings but to my strange I cannot dial or receive phone calls, I am receiving and sending sms perfectly the phone GPRS working alright tried different methods of changing band but nothing is working to dial or receive voice call. In order to check if there is problem itself with the phone I tried different network (Ufone) sim and the phone is working perfectly without any problem so I am stuck that I cannot use my network which I normally use and I dont want to switch network, if somebody can help to fix this problem.
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:
Telephone after turning off / on wifi (exit from wifi range).
By calling (incoming calls) the number of telephones (sim cards in phone) - a message appears that the number is off or off the reach (the phone shows the full range).
Phone pro3 x720 linage os 8.1 (latest version) modem updated, last TWRP, cleaning, erasing settings done. How to solve this problem?
Turning the sim card (phone) off / on solves the problem until the next turn on / off the wifi.
toktom said:
Telephone after turning off / on wifi (exit from wifi range).
By calling (incoming calls) the number of telephones (sim cards in phone) - a message appears that the number is off or off the reach (the phone shows the full range).
Phone pro3 x720 linage os 8.1 (latest version) modem updated, last TWRP, cleaning, erasing settings done. How to solve this problem?
Turning the sim card (phone) off / on solves the problem until the next turn on / off the wifi.
Click to expand...
Click to collapse
Reflash your firmware, clear cache, reboot.
The phone is reset to the default settings. deleted recovery (dalvik, cach., etc.). The problem mainly occurs with the included wifi on the sim1 card. On the sim 2 from which there is a data transfer (when the wifi is ok). A call to the sim card appears a message (off or out of range - the phone is on range)
toktom said:
The phone is reset to the default settings. deleted recovery (dalvik, cach., etc.). The problem mainly occurs with the included wifi on the sim1 card. On the sim 2 from which there is a data transfer (when the wifi is ok). A call to the sim card appears a message (off or out of range - the phone is on range)
Click to expand...
Click to collapse
Are you rooted? Please provide more info about your phone, whats installed, any mods?
Try using LTE Discovery: https://play.google.com/store/apps/details?id=net.simplyadvanced.ltediscovery&hl=en_US
This is the absolute best app for sorting out signal issues, read through the steps to set up correctly, it needs root. Have you tried alternate APNs, In Mobile network settings, what do you have selected? Global?
Linage Os ver.15.1 20180529 nightly zl1 sering network global. The problem occurs when I connect via wifi. Making a call with sim 2 for a moment is ok.
Same thing happens with my x720, changing cdma setting usually fixes it but only until next time I leave wifi. 26s modem/baseband files and lineage 14.1. Lte Signal is there it just wont start data roaming by itself after leaving wifi.
Try putting it in airplane mode
Sent from my SM-A730F using xda premium
mchlbenner said:
Try putting it in airplane mode
Sent from my SM-A730F using xda premium
Click to expand...
Click to collapse
That works too, but only until next time I leave wifi network.
I use two sim cards. The problem arises with the use of wifi on one sim1 card (it is set that the internet is from sim2. - sim1 does not have internet broadcast enabled)
I upgraded to linage 15.1 and got a new operator with new sim card so the problem went away for me by itself after swapping out the sim card.
Guys,
I need help with my network reception issue in OnePlus 6T.
To brief you about its history,
I believe this started from OS Update 9.0.17 where below change-log was introduced,
Re-activated the calling function after the network has been reset.
At present my device is with 10.3.0 OS which is Android 10 based.
In issue description,
1. In some cases I receive network but it will not at all working (like in-out call & SMS). For inbound calls, my device shows out of coverage and for outbound calls it just keep on trying connecting and then get disconnected.
2. In some cases I will not receive network reception itself.
3. Issue reported with BSNL Network only. I tried with 3 different BSNL SIM and issue remain same for all.
4. No other network is affected (irrespective of 2G/3G). I tested with Airtel & Vodafone, where its working with 2G & 3G both.
Troubleshooting steps,
1. Tried flashing device completely (From OS & Recovery Both) - No Solution
2. Tried downgrading OS to 9.0.4 - No Solution
3. Tried selecting 2G network manually - It throws error as selected network is not available.
4. Tried changing Network Reception Scope to GSM/WCDMA only for BSNL Network slot (SIM2) - No Solution
5. Tried using BSNL only in SIM1 slot (keeping SIM2 empty) - No Solution
6. These same SIM Cards (JIO & BSNL) are working fine presently in my another OnePlus 5 device.
7. Tried disabling DSDS (Dual SIM Dual Standby) from *#*#4636#*#* but its not getting deactivated & remained active always.
I verified with Network Cell Info Tool where this BSNL network is showing greyed out (I dont know what does that mean) but I believe its representing internal root cause of this issue.
In app, neighboring cell is also losing connectivity randomly and not steady for BSNL network only.
It seems I've hit the same issue with my OnePlus 6 since the last couple of days. Happened after I did a 'reset network settings'. No solution yet. I have changed to a new BSNL 4G SIM and had factory reset of the phone.
Now the phone is with the service centre.
How did you resolve this issue?