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[Q] Unlocking Mobile Data on Second Sim

Good day.
I currently have the Galaxy S6 dual sim version bought from a local network. It seems that although the second sim (whether in slot 1 or slot 2) can be used for SMS and calls, it CANNOT be used for mobile data.
I've tried flashing a supposedly OPEN LINE stock firmware (XTC brand, version 5.0.2) to try and open up both slots for mobile data, but although the phone firmware definitely updated, the second sim still is locked out from being used for mobile data. APN settings are locked for the second sim, again whether it was in slot 1 or slot 2.
Will flashing a different firmware (NOT FROM our country) work in unlocking the mobile data access? Will I have issues if the CSC comes from another country while I use this phone here at home?
Thanks!

Help with build.prop settings
So I've tried rooting and going around the build.prop file. I've tried to install a couple of lines that seemed to open up the APN settings of other network-locked phones:
ril.sales_code=LOL
ro.csc.sales_code=LOL
However, I'm only still able to add or modify APN settings for the sim of the network but not for a sim for another network. Maybe there's a modification to the build.prop file that can be done to finally open up APN settings for both sims?

UP
Still hoping someone can help me with this, either with a firmware for the dual sim version that can unlock the data/APN settings for any sim in both slots or possibly some build.prop tweak settings that can do the same.

SOLVED
Was able to find a tech guy who downloaded a program that "debranded/unbranded" the unit, making it a plain vanilla S6 Duos. Now any sim can work with data in any slot, APN settings activated.

link to the program please

Hello, I'm having the same problem, could you advise what was done to make your apn setting enabled?

Yes, link to the program will be very useful to all of us.

DRHTPH said:
Was able to find a tech guy who downloaded a program that "debranded/unbranded" the unit, making it a plain vanilla S6 Duos. Now any sim can work with data in any slot, APN settings activated.
Click to expand...
Click to collapse
hi, am very interested in the solution to this issue. can you provide us more information?
what was the program used. or who this tech guy is, and where can we find him. also, how much did you spend. thanks!

Dual sim settings problem

Hi. I`ve got an MHA-L29 and I`ve got a problem with dual sim settings. In dual sim setting menu if I select default mobile data (4G services associated with default SIM) on SIM 1 then I lose the signal from that sim (Emergency calls only) and I`ve got SIM 2 signal. If I select default mobile data on SIM 2 I lose signal from that sim and I receive signal on SIM1. Basically, I can`t have both sim working (network signal) because I need to set 1 SIM on default mobile data and the one that I set it`s losing signal.
Maybe someone can help me. Thanks

Coscovitul said:
Hi. I`ve got an MHA-L29 and I`ve got a problem with dual sim settings. In dual sim setting menu if I select default mobile data (4G services associated with default SIM) on SIM 1 then I lose the signal from that sim (Emergency calls only) and I`ve got SIM 2 signal. If I select default mobile data on SIM 2 I lose signal from that sim and I receive signal on SIM1. Basically, I can`t have both sim working (network signal) because I need to set 1 SIM on default mobile data and the one that I set it`s losing signal.
Maybe someone can help me. Thanks
Click to expand...
Click to collapse
This is strange behavior.
By default there is no problem. See my screenshot.
I suppose it is mobile operator's problem.
What is your full version (settings / about phone / build version) ?
What is your country and mobile carriers?

It`s not a mobile operator problem. I use the same sims on mate 8 and it`s fine. It`s exactly like in your screenshot, sim 1 default mobile data and I lose signal, and I have signal on sim 2. If I select sim 2 default mobile data I lose signal on sim 2 and receive signal on sim 1. So basically I can`t use dual sim and mobile data.
I`m in UK with BT and Lycamobile.
Build version was MHA-L29C432B198 but I`ve tried different things and now I`ve got nrd90m test-keys.

Coscovitul said:
It`s not a mobile operator problem. I use the same sims on mate 8 and it`s fine. It`s exactly like in your screenshot, sim 1 default mobile data and I lose signal, and I have signal on sim 2. If I select sim 2 default mobile data I lose signal on sim 2 and receive signal on sim 1. So basically I can`t use dual sim and mobile data.
I`m in UK with BT and Lycamobile.
Build version was MHA-L29C432B198 but I`ve tried different things and now I`ve got nrd90m test-keys.
Click to expand...
Click to collapse
Agree, C432 region is for UK too. So your bug must not exist, but it is here.
Nrd90m test-keys means that metadata from oeminfo does not match with current ROM.
Did you try to rebrand? If yes, just flash ROM again what you flashed last time.

I`m trying now to rebrand, watching tutorial but I`m stuck at
After device enter TWRP, connect to USB cable.
Press ENTER key to continue...
* server not running *

Coscovitul said:
I`m trying now to rebrand, watching tutorial but I`m stuck at
After device enter TWRP, connect to USB cable.
Press ENTER key to continue...
* server not running *
Click to expand...
Click to collapse
Something blocked adb. Maybe HiSuite. Turn it off, then check that pc recognises device.
adb devices
You can issue to refresh adb
adb kill-server
Phone must be in twrp.

I`ve managed to do all the steps, but after restart I can`t get past the Huawei logo, phone enters in Huawei eRecovery where I have Download latest version and recovery (restore your system with wifi) reboot or shutdown. I`ve tried to restore the system with wifi but I can`t (getting package info failed). I don`t know what went wrong during the process but the phone it`s stuck at huawei erecovery.

So now I`ve managed somehow to update emui to 8.0 and android 8.0 and I have build number MHA-L29 8.0.0.321 (C432log), but the initial problem it`s still there.
I still can`t use mobile data or both sims in the same time. The sim selected to be default mobile data lose signal.
I`ve tried to use 1 sim and sdcard but I don`t have signal because the sim it`s set by default to be mobile data.
Anyone?

Coscovitul said:
So now I`ve managed somehow to update emui to 8.0 and android 8.0 and I have build number MHA-L29 8.0.0.321 (C432log), but the initial problem it`s still there.
I still can`t use mobile data or both sims in the same time. The sim selected to be default mobile data lose signal.
I`ve tried to use 1 sim and sdcard but I don`t have signal because the sim it`s set by default to be mobile data.
Anyone?
Click to expand...
Click to collapse
Seems to be hardware issue. Do you have warranty?

I don`t have warranty. Both sims slots work fine one at the time, not together.
I need 10 posts on the forum so I can upload a screenshot.

Coscovitul said:
I don`t have warranty. Both sims slots work fine one at the time, not together.
I need 10 posts on the forum so I can upload a screenshot.
Click to expand...
Click to collapse
OK. Last thing - try to delete and recreate apn settings.
Don't think that they all incorrect, but maybe one of them...

The Mate9 is active/passive: it's impossible to make a call using sim 1 and using mobile data with sim2 but in stand by you can receive calls on both sim. This limitation is not present on mate8 and mate10.
Piergiorgio

I`ve tried other sims, put new apn and it`s the same.
pgmunzi I can`t because I don`t have signal on one of the sims. In dual sim settings, I need to set sim1 or sim2 to be default mobile data. With sim1 set on default mobile data, I`ve got signal on sim2 and no signal o sim1 (emergency call only), not even to receive. With sim2 set on default mobile data, I`ve got signal on sim1 and no signal on sim 2.

Coscovitul said:
I`ve tried other sims, put new apn and it`s the same.
pgmunzi I can`t because I don`t have signal on one of the sims. In dual sim settings, I need to set sim1 or sim2 to be default mobile data. With sim1 set on default mobile data, I`ve got signal on sim2 and no signal o sim1 (emergency call only), not even to receive. With sim2 set on default mobile data, I`ve got signal on sim1 and no signal on sim 2.
Click to expand...
Click to collapse
You can only have data on SIM1. Both sims can be used for calls and SMS (to my understanding). If you have two SIM cards from the same network it should not be a problem, overall. If you have two different networks (one on each SIM) then you might have some issues.
If you have the SIMS on the same network, and they use the same APN, you might want to copy the settings to two different APN's a label them for SIM1 and SIM2.
Also be careful of what version of OS you use. If you download a version that is originally branded for something else, then expect problems. There are also "Gotcha's" with firmware that is taken from one device and reconfigured to work on your device. Usually this is a matter of rebranding and copying underlying code over. This too causes issues with dual SIM phones. I have found this to be true with my MHA-L29C567. Sadly, I would love to have a memory card under the second sim slot along with a second SIM, but I have yet to figure that one out...

hs4842 said:
You can only have data on SIM1. Both sims can be used for calls and SMS (to my understanding). If you have two SIM cards from the same network it should not be a problem, overall. If you have two different networks (one on each SIM) then you might have some issues.
If you have the SIMS on the same network, and they use the same APN, you might want to copy the settings to two different APN's a label them for SIM1 and SIM2.
Also be careful of what version of OS you use. If you download a version that is originally branded for something else, then expect problems. There are also "Gotcha's" with firmware that is taken from one device and reconfigured to work on your device. Usually this is a matter of rebranding and copying underlying code over. This too causes issues with dual SIM phones. I have found this to be true with my MHA-L29C567. Sadly, I would love to have a memory card under the second sim slot along with a second SIM, but I have yet to figure that one out...
Click to expand...
Click to collapse
Just got the same problem (2 sim cards from same network, only obe working at a time) and thanks to you it's solved. I just had to rename the second APN differently.

I have the same problem. Is it solve? Hv been searching for solution.

Hello guys.. I have the same problem in my mha-l29. Did you solve it?

Coscovitul said:
Hi. I`ve got an MHA-L29 and I`ve got a problem with dual sim settings. In dual sim setting menu if I select default mobile data (4G services associated with default SIM) on SIM 1 then I lose the signal from that sim (Emergency calls only) and I`ve got SIM 2 signal. If I select default mobile data on SIM 2 I lose signal from that sim and I receive signal on SIM1. Basically, I can`t have both sim working (network signal) because I need to set 1 SIM on default mobile data and the one that I set it`s losing signal.
Maybe someone can help me. Thanks
Click to expand...
Click to collapse
hi i just wanna ask if uve solved this, Im currently facing the same problem

my both sim are working fine but some time one sim card not work when i reinsert sim. it does work. so what is the issue?

Help needed "no sim card" when dialing a number (LG V50 Sprint)

LG V50 Sprint no calls and sms?
I got this phone unlocked and updated working fine with LTE data connection with my provider here ooredoo Algeria fast and stable.
The problem itt showes phone signal is full but when I dial a number it says "no sim card"
+ sms is not working altogether as well.
Any help fix / pointers would be greatly appreciated

Hi!
The same thing happened to me, I couldn't send messages or call until I activated the automatic network mode, otherwise it wouldn't let me call.
I hope I have been helpful with this.

Mc AGV said:
Hi!
The same thing happened to me, I couldn't send messages or call until I activated the automatic network mode, otherwise it wouldn't let me call.
I hope I have been helpful with this.
Click to expand...
Click to collapse
Yes I did reset the network settings last night the phone calls work fine now, But the sms texting still a nogo.

dark4m said:
Yes I did reset the network settings last night the phone calls work fine now, But the sms texting still a nogo.
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Click to collapse
The same problem happened to me, i tried everything..
The only thing that fixed it is:
1. Insert a Sprint SIM card (in my case it came with the device when I baught it. I never had service from sprint and I lived overseas)
2. Select settings >> Network and Internet >> Network settings reset.
3. That is it!
Please note that this method only worked when I inserted Sprint Sim card, it did not work with my actual sim card..
After the settings were reset, I removed Sprint SIM, and inserted the other SIM, and it worked perfectly!

Ialzaben said:
The same problem happened to me, i tried everything..
The only thing that fixed it is:
1. Insert a Sprint SIM card (in my case it came with the device when I baught it. I never had service from sprint and I lived overseas)
2. Select settings >> Network and Internet >> Network settings reset.
3. That is it!
Please note that this method only worked when I inserted Sprint Sim card, it did not work with my actual sim card..
After the settings were reset, I removed Sprint SIM, and inserted the other SIM, and it worked perfectly!
Click to expand...
Click to collapse
This worked once for me, then I had to remove my tray to insert an sd-card and didn't work anymore... network settings struggle to reset (will take 10-20s and then crash out) what could it be? I'm using a heicard and discussing the procedure in this thread: https://forum.xda-developers.com/t/unlocking-lg-g8-sprint-bad-esn.4092771/page-2
UPDATE: if you still get the "SIM not provisioned for voice" message, do a backup, then full restore of the phone, then repeat the above steps. You should now be able to make phone calls, but not connect to LTE. Download an app called "AddAPN" from the play store and manually save the Access Point Name for your carrier (yours will be different from mine, but I'll add it as reference, it's in italian, but you should get the gist, relevant steps are 10 through 14: https://www.helpforsmartphone.com/coopvoce/it/lg/g6/android-8-0/guides/22/Configurare-Internet-LG-G6)

with my sprint lg v50 and i can "Add APN" already.
i dont need an app

@en11gma Are you on android 9 or 10,and what is your security patch level?
Thanks.

Question SM-A536U1/DS Dual Sim tray, but only one IMEI, no Dual Sim capability

Hello,
I purchased that phone off eBay since it was listed as Dual sim, the sim tray support Sim+Sim/SD Card, but only has 1 IMEI, so inserting a sim card in the second sim slot, do nothing. I read that dual sim will be enabled with software update, but I updated software to September 1 security patch level, but nothing has changed.
Service provider software version is: SAOMC_SM-A536U1_OYM_XAA_12_0009 XAA/XAA/XAA

Maybe your card faces the wrong direction ? Contacts have to show to the outside.
Check in the settings menu 'connections->sim-card administration' if there is a (greyed out) second sim slot available and look at 'phone info->status information->IMEI-info' if there is a second slot entry with corresponding number just to be sure that there isn't a software issue.

Andoreid said:
Maybe your card faces the wrong direction ? Contacts have to show to the outside.
Check in the settings menu 'connections->sim-card administration' if there is a (greyed out) second sim slot available and look at 'phone info->status information->IMEI-info' if there is a second slot entry with corresponding number just to be sure that there isn't a software issue.
Click to expand...
Click to collapse
No. There is no sim card manager settings. Sim card is inserted correctly, only one IMEI, so that's why 2nd SIM is not working

Expected that all sm-a536 devices support dual-sim. Maybe it's a restriction from your carrier or firmware since you still got the Sim+SD/Sim2 slot. Seems the us variants are a bit cut short with no unlockable bootloader ec..

Helloo!! Any progress on this? IF I install another version like the EU one, would I see the dual sim options? I can be believe the phone is hardware capable but the firmware blocks it

Hi every one !
Anyone has an idea of how to unlock the dualsim capability ? Maybe by flashing a different region/country firmware ?
Thanks !

I just checked for a software update and I got the Android 13 and UI 5 update (near 2GBs) and the dual sim capability was enabled with this update. A second IMEI appears and the 2 sim cards got both signal.
Before installing the update, I took out the SD card and placed a 2nd SIM. Don't know if that had something to do with the dual sim capability enabling.
The Dual Sim Capability is not the same as with other Samsungs. You have no option to set a SIM card as default for calls and text or always ask before making a call, and the other one as default for DATA, only as primary, and the primary is the default for everything. But with the Google phone APP I was able to set the SIM Settings to either one or always ask.
It doesn't have a separate Network Mode for secondary SIM either.

xonyl said:
See
Click to expand...
Click to collapse

Glad I'm not alone in this. It's like pulling teeth with people convincing them there's an unlocked dual-sim us version sm-a536u1 (sm-a536uzkdxaa). Obviously Samsung is little help in this. I've removed the actual IMEI numbers for obvious reasons.

Question TB-J616X - no SIM settings page after update to Android 12

My Tab P11 Plus has been updated to Android 12 recently. The SIM card is detected and shows the mobile provider name on the Wi-Fi and network settings page, but when you tap on it to open the detailed SIM card settings page, nothing happens. I tried a different SIM card and it works ok, the only difference is that the other SIM card doesn't support VoLTE while my original one (that no longer works) supports it. I also tried to remove the PIN from the SIM card and reset all the network settings.
The SIM card works ok in other devices.
Is there anything I can do via the adb, to delete all the SIM card related data? I don't want to do a complete reset, as it takes almost a week to setup evetyhing from the scratch again. Thank you.