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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.
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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!

How to enable Lenovo Yoga Tab 3 phone call ?

Hi there,
I got a European version of Lenovo Yoga tab 3 android tablet (YT3-X50L). The Y3-X50L version compared to YT3-X50M version, does not have a phone call app and it meant to be restricted for surfing only even though it has a sim card slot.
I have changed its firmware to YT3-X50M to be able to use it as a normal phone. Here is the problem:
the phone can send and receive sms through the cell network but using it to phone call, the calls get disconnected immediately after dialling and no phone call comes in either.
It seems to me that there should be a way to activate/unlock the phone ability. Any help is appreciated.

amirbekam said:
Hi there,
I got a European version of Lenovo Yoga tab 3 android tablet (YT3-X50L). The Y3-X50L version compared to YT3-X50M version, does not have a phone call app and it meant to be restricted for surfing only even though it has a sim card slot.
I have changed its firmware to YT3-X50M to be able to use it as a normal phone. Here is the problem:
the phone can send and receive sms through the cell network but using it to phone call, the calls get disconnected immediately after dialling and no phone call comes in either.
It seems to me that there should be a way to activate/unlock the phone ability. Any help is appreciated.
Click to expand...
Click to collapse
AMIRBEKAM,
I've got a similar YT3-850L, with SIM slot intended for DATA, not PHONE. I'd wondered what would happen if I flashed with the "M" ROM. You SEEM to have answered that question. BUT, may I ask you a few questions, please?
1) Is your tablet ROOTED?
2) If YES, was that before or after the "M" ROM was flashed, or both?
3) Is your SIM card ACCOUNT VOICE as well as DATA ENABLED with your CARRIER? (In the US, at least, DATA and VOICE/DATA SIM cards are NOT interchangeable. So, if that's the case with your carrier, that MIGHT be the problem, or part of it).
4) What approach did you use to flash the "M" ROM
5) Where did you GET the "M" ROM
I put my VOICE/DATA SIM card in my YT3-850L, and it didn't work for DATA. T-Mobile said it SHOULDN'T work with data on my tablet, as it requires a DATA ONLY SIM account for a DATA-ONLY tablet. They're shipping me a SIM card which they say will allow DATA ONLY on my "L" Yoga tablet. We'll see you THAT works.
THANKS!

I have got yoga tap 3 8 and I m not getting phone call neither I am able to call calls get disconnect as soon as I dialed the number

G955FD - Dual SIM - VoLTE for both SIMs in Canada?

Hi All
I flashed the Canada multi-csc on my G955FD hoping to get LTE while on the phone (VoLTE)
However when I make a call with Sim #1 (TELUS) I have no LTE.
When making a call with Sim #2 (Bell), I do have LTE.
I have my Calls set to SIM 1, i have Texts set to SIM 1, and Mobile Data to SIM 2
When i reboot the phone a popup appears that asks which number i want to use as my primary for apps, and i always choose my TELUS number. I assume this is asking for things such as Whatsapp and how it maps to your cell number?
Anyone know what's wrong?
Is it possible that the Multi CSC is not adding TELUS's details properly?
Or can i simply only have VoLTE with one SIM and not both?
EDIT: Through testing i confirmed that whichever SIM is set to Data will be the only SIM that you can make VoLTE calls on.
Here is a thread in the S9 forums discussing the same limitation
https://forum.xda-developers.com/galaxy-s9-plus/help/s9-duos-exynos-dual-sim-dual-volte-t3756817

Bump

You are correct; only the SIM set as Data will be able to operate in VoLTE mode.
Samsung has added Dual LTE to S9/S9+ variants with recent update though, so both SIM can operate in VoLTE mode simultaneously (irrespective of Data SIM selection). You can only hope that Samsung brings the same feature to S8/S8+ too; it depends upon hw support.

S8/S8+ hardware is not capable of Dual VoLTE. So it will never arrive.

The note 5 pro from Xiaomi supports dhak volte after a software update a d I know that because I did it on a 6gb 64 gb model a few hours ago. I think the s8,s8+ and note 8 surely have better hardware than Xiaomi note 5 pro right?

VZW WIFI Calling on unlocked Note 20 ultra 5G

Found out the guy lied. So the US unlocked N20U does work with VZW wifi calling.

It definitely does work with my N20U on Verizon.

The only differences between the Unlocked and VZW version are:
1. Native Verizon video calling doesn't work on unlocked, but the integrated Duo video calling is better anyways.
2. Verizon's model doesn't have the Samsung "Smart Call" feature for Caller ID. Instead, it uses Verizon's app.
3. Verizon's version has the Verizon bootscreen and a ton of bloatware, especially games, news apps, and what not. Fortunately, most can be uninstalled, and the rest can be disabled using ADB.

Guyinlaca said:
The only differences between the Unlocked and VZW version are:
1. Native Verizon video calling doesn't work on unlocked, but the integrated Duo video calling is better anyways.
2. Verizon's model doesn't have the Samsung "Smart Call" feature for Caller ID. Instead, it uses Verizon's app.
3. Verizon's version has the Verizon bootscreen and a ton of bloatware, especially games, news apps, and what not. Fortunately, most can be uninstalled, and the rest can be disabled using ADB.
Click to expand...
Click to collapse
I can confirm all of the above. I have an unlocked phone, on U1 firmware, with a Verizon SIM. Wifi calling works. There is no "Advanced Calling" menu in Connection Settings, but there's a toggle for VoLTE and it was switched on by default. No 4G icon, but rather a LTE+ icon is shown in status bar. The only thing I haven't found a workaround for is the native video calling. I cannot initiate it (phone app does not show the option when I'm on a call with another Verizon phone) and if another Verizon phone attempts to initiate a native video call, it tells them that I cannot accept video calls. I checked my VZW account settings on a PC, and despite the video call option being on and not blocked, native calling doesn't work, as described above. Duo works fine for video. I was able to get Visual Voicemail by installing the app that I go from another thread. I installed it before checking to see if the U1 firmware added it by default, so I can't say for sure that it wasn't there already.
Sent from my SM-N986U using Tapatalk

So I had an interesting observation. I flashed my Verizon Note 10+ to U1 firmware and noticed a drastic reduction in data speeds. After getting the Note 20 Ultra, I noticed the data speeds were nearly doubled. I then disabled a ton of Verizon and Samsung apps, and my data speeds dropped drastically as well. Through the process of elimination, I found that the "My Verizon Services" app seems to have a major impact on data speeds. As long as I keep that enabled on the Verizon firmware, data speeds are blazing fast.
Is it possible that Verizon uses apps to prioritize or de-prioritize data speeds? I'd be curious if one could do a side by side of the Unlocked vs Verizon firmware.

ferzmedina said:
I can confirm all of the above. I have an unlocked phone, on U1 firmware, with a Verizon SIM. Wifi calling works. There is no "Advanced Calling" menu in Connection Settings, but there's a toggle for VoLTE and it was switched on by default. No 4G icon, but rather a LTE+ icon is shown in status bar. The only thing I haven't found a workaround for is the native video calling. I cannot initiate it (phone app does not show the option when I'm on a call with another Verizon phone) and if another Verizon phone attempts to initiate a native video call, it tells them that I cannot accept video calls. I checked my VZW account settings on a PC, and despite the video call option being on and not blocked, native calling doesn't work, as described above. Duo works fine for video. I was able to get Visual Voicemail by installing the app that I go from another thread. I installed it before checking to see if the U1 firmware added it by default, so I can't say for sure that it wasn't there already.
Sent from my SM-N986U using Tapatalk
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Thanks for sharing your observations regarding wifi calling. How can one tell it is working? I am used to older phones advising that wifi calling was in use via text in the phone app. I'm not seeing this notification on my new unlocked T-Mobile-branded N20U with Verizon SIM.
I also noticed the VoLTE toggle in the phone app, switched on and greyed-out, can't be deselected. Of course they don't want to support anything but VoIP anymore. What is the behavior, if the cell signal is decent it won't use wifi? It can't be forced to prefer wifi, can it? I used the trick of putting it in airplane mode, then turn on wifi to try and force it to wifi call. It said it couldn't make the call in airplane mode, which is not encouraging regarding wifi calling being functional on this phone/provider combo.

[email protected] said:
Thanks for sharing your observations regarding wifi calling. How can one tell it is working? I am used to older phones advising that wifi calling was in use via text in the phone app. I'm not seeing this notification on my new unlocked T-Mobile-branded N20U with Verizon SIM.
I also noticed the VoLTE toggle in the phone app, switched on and greyed-out, can't be deselected. Of course they don't want to support anything but VoIP anymore. What is the behavior, if the cell signal is decent it won't use wifi? It can't be forced to prefer wifi, can it? I used the trick of putting it in airplane mode, then turn on wifi to try and force it to wifi call. It said it couldn't make the call in airplane mode, which is not encouraging regarding wifi calling being functional on this phone/provider combo.
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Click to collapse
From what I've found, if you put another carrier's SIM in a truly unlocked carrier branded phone, it should prompt you to apply your carrier settings upon boot. For example when I put a Spectrum SIM in a Verizon phone, it "converted" the CSC (Carrier settings and boot logo) to Spectrum.
My recommendation is to attempt to get the SIM to switch the CSC automatically. If not, use the patched ODIN to flash the Unlocked U1 firmware, and optionally you can flash Verizon from there if Verizon's Video Calling is a must.

Guyinlaca said:
From what I've found, if you put another carrier's SIM in a truly unlocked carrier branded phone, it should prompt you to apply your carrier settings upon boot. For example when I put a Spectrum SIM in a Verizon phone, it "converted" the CSC (Carrier settings and boot logo) to Spectrum.
My recommendation is to attempt to get the SIM to switch the CSC automatically. If not, use the patched ODIN to flash the Unlocked U1 firmware, and optionally you can flash Verizon from there if Verizon's Video Calling is a must.
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Thanks for the detailed response. I was a little concerned about the T-Mobile branding, and what that truly meant at the software level. I installed the Verizon SIM to this factory-reset phone. If it was going to switch CSC I think it would have happened then. It went through the usual setup steps, but still displays T-Mobile screen at boot. I'm not sure what else I would do to "get the SIM to switch the CSC automatically".
Would you agree with my conclusion that wifi calling isn't working based on the outgoing call failure when in airplane mode with wifi on?
If there is better, more-unlocked firmware I'm not opposed to flashing it. It's been a while since I've played with rooting and custom ROMS, but I'm guessing stock firmware is a lower-risk activity on an expensive phone.
I'll refer to this link to try and flash to unlocked U1 firmware, hopefully that will allow wifi calling compatibility:
OTA and Non-OTA Firmware for N986U and N986U1

Can you flash ATT, VZW to XAA Branded in Download Mode

Forgive me if this has been covered but I havn't found the answer. I've flashed just about every phone I've ever had but my question here is can I / how do I flash to where the phone reads as XAA in download Mode?
The situation is my phone was originally on at&t. They unlocked it and I'm on Verizon. It all works great (it still says at&t on download Mode screen)
My problem is that if I log into the my Verizon app it disables my visual voicemail. I finally got a Verizon tech on the phone that explained that it is unsupported due to originally being on a different carrier and their system identifies that and disables the VVM. The only fix I can find is to put my sim in my backup S9+ that came from Samsung unlocked (or any Verizon phone) and I can then reactivate my VVM by resubscribing.
I currently have 3 Note 20 Ultras. One Each originally from Samsung, ATT and Verizon but the AT&T is the only one that is 512GB or I would just switch phones. I have flashed them all to U1 firmware but notice they all still reflect the original carrier in Download Mode so again my question is can I change this by flashing it / or is it just a matter of what sim card is in it when it's flashed? I need it to be seen as XAA by Verizon system so not to loose VVM... Pics attached.
Any advice here is greatly appreciated in advance.

Just a try... You can try the *#272*imei# method... But thats If it works. Not sure if the sims has to be in the phone for that to work.

GDHAMTON7 said:
Just a try... You can try the *#272*imei# method... But thats If it works. Not sure if the sims has to be in the phone for that to work.
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Yes it brings up this menu... So I just select the XAA and that's it? I've been reading forums and this method is reversible it seems ... I'm familiar with Odin and all that but these hidden menus are new to me...
Thanks for the reply btw

You may have to activate the bottom most option to stay.
Don't worry if you can't access the menu after the change. You can download samsung band selection and change to automatic or one of the lte options then back to automatic to get to the menu.

CSC Guide
CSC (which I think means Carrier Service Code) helps to set what options for settings show in the device for things like voicemail and wifi calling, as well as sets network code information for things like carrier aggregation combos.
When you go to your phone settings->about phone->software information and look in the Service Provider SW ver. section, you will see as the last line a combo like XXX/YYY/ZZZ. This indicates what carrier sales and network code is set and what brand the phone was manufactured as.
I think of the XXX/YYY/ZZZ configuration as follows
XXX=Sales Code-What kind of features are setup in the firmware like wifi calling, video calling and settings menus
YYY=Network Code-What kind of network features are set for things like carrier aggregation and LTE/5G bands
ZZZ=Manufactured as Code- What model the phone was originally manufactured as. Ot has no affect on the system settings or options. THIS CAN NOT CHANGE. IT SHOULD ALWAYS BE THE SAME. ONLY A ROOTED PHONE WOULD BE ABLE TO ACCESS THE FILES NECESSARY TO CHANGE THIS.
for more details, refer to post:-
[Guide] Service Mode and CSC Guide/Enable LTE/5G Bands and Services/5G Low Band on U1
Hello All, Many people have asked about service mode and CSC related questions and I thought we should get a discussion going that is all in one place. *DISCLAIMER* I do not take any responsibility for any issues that may occur from changing...
forum.xda-developers.com