Q: Unlocking phone for international use - Nexus 6 Q&A, Help & Troubleshooting

I received an unlock code from AT&T to unlock my phone for use with other carriers so that I can use it when I travel outside the country. But it's not working for some reason. Here is what happens:
Turn phone off
Take out AT&T SIM card and replace with friend's T-Mobile SIM card
Boot phone completely
Phone automatically prompts me for unlock code which I enter
Phone goes to home screen
Phone prompts me again for unlock code
I tried 3 times and stopped trying because after 5 attempts the phone supposedly permanently locks to the AT&T network.
I AM rooted running CM13. Is that the issue? If so, what do I need to do to get the unlock to work? I tried searching but I'm only seeing results related to unlocking bootloader, etc, not surprisingly haha. Thanks!

Your system must be totally stock to SIM unlock the Nexus. Flash a stock image.

Strephon Alkhalikoi said:
Your system must be totally stock to SIM unlock the Nexus. Flash a stock image.
Click to expand...
Click to collapse
Okay to keep bootloader unlocked and keep root? Just need the stock ROM?
And then once I flash stock image and unlock SIM, okay to reflash CM13? And the SIM will remain unlocked?
Thanks again!

I wouldn't bother with root on the stock image since you'll be reinstalling your custom ROM afterward, but you can keep your bootloader unlocked without worry. Once SIM unlocked, the Nexus stays unlocked.

Related

[Q] Sim Unlock Code Not Accepted

Hi,
I have HTC one on Three UK network. I took Sim network unlock code from 3 different paid servers, All have given same code but code does not work. It says Sim Password incorrect. Spoken to supplier and he said it is some bug in new android system. Can anyone explain me how to fix this. I appreciate that.
I already 3 tried another source and checked imei etc.
talkways said:
Hi,
I have HTC one on Three UK network. I took Sim network unlock code from 3 different paid servers, All have given same code but code does not work. It says Sim Password incorrect. Spoken to supplier and he said it is some bug in new android system. Can anyone explain me how to fix this. I appreciate that.
I already 3 tried another source and checked imei etc.
Click to expand...
Click to collapse
Are you on a custom CID ? On a custom ROM? If yes, change them back to the original and it'll work.
attanasi0 said:
Are you on a custom CID ? On a custom ROM? If yes, change them back to the original and it'll work.
Click to expand...
Click to collapse
No it is original rom, original recovery but still not accepting. In attempt to flash i loaded up custom recovery now but unable to find any stock rom ruu on three. Hbot is 1.54 and s on and bootloader locked (i unlocked it using htcdev now)
talkways said:
No it is original rom, original recovery but still not accepting. In attempt to flash i loaded up custom recovery now but unable to find any stock rom ruu on three. Hbot is 1.54 and s on and bootloader locked (i unlocked it using htcdev now)
Click to expand...
Click to collapse
This is purely anecdotal but the phone I had before this was the s2 LTE model on AT&T, when they gave me the code it kept saying it was unsuccessful until I ran out of attempts. However when I actually put in a t-mobile sim card it worked fine and it was fully unlocked. Maybe try that?
Danmanlott said:
This is purely anecdotal but the phone I had before this was the s2 LTE model on AT&T, when they gave me the code it kept saying it was unsuccessful until I ran out of attempts. However when I actually put in a t-mobile sim card it worked fine and it was fully unlocked. Maybe try that?
Click to expand...
Click to collapse
You do know that to unlock the phone you need a SIM card from a different company inside the phone so that it asks for Network Unlock Code... SIM Lock is not the same...
attanasi0 said:
You do know that to unlock the phone you need a SIM card from a different company inside the phone so that it asks for Network Unlock Code... SIM Lock is not the same...
Click to expand...
Click to collapse
Obviously phone is asking for sim network unlock code when we put non accepted sim card. So phone is not unlocked. We do quite a lot unlocking and few phones get this error, we have to refund customer but I am seeking solution for it. It is only in Android phones (HTC and Samsung).. Samsung's we usually unlock using unlocking boxes but HTC One is not supported other than code. (Setool support older HBOOT).

[Q] Stock ROMS and SIM Unlock

I was reading this thread about how to install Stock ROMs in the Lumia phones.
The process seems pretty easy. But since I'm a lurker the system did not allow me to make my question there. So here it goes.
If the phone was from a carrier, say AT&T, and it was unlocked by them to be used in any network, will the installation of a stock ROM:
1) Keep the phone unlocked because, DUH! is stock firmware
2) Keep the phone unlocked because it was unlocked before
3) Lock the phone again because some setting is lost
So, any idea about this? The installation of a stock ROM would be a solution to unlock a Lumia phone?
No. To SIM unlock one the only way is to enter the code given from the MO that branded the device. Now... if the device has been previously been unlocked, it will persist flashing because the cellular settings are untouched when flashing. (Unless its stuff relating to the MMS and internet APNs, that will be overwritten when it is reflashed.)

[Q] SIM Network Unlock Issue Even After Flashing with AT&T Stock Rom

Hi All -
I've searched everywhere for the answer to this and haven't been able to find it, so I figured I'd post here. This is the scenario:
1) I have a Moto X that is locked to AT&T
2) I wanted to give the phone to a friend who is on Sprint, so I paid for an unlock code
3) Even after unlocking and inserting the Sprint SIM, I still received the "SIM Network Unlock PIN" message
4) I now want to basically restore the phone completely back to the way it was (locked to AT&T), so it can be used with an AT&T SIM
5) I flashed the phone using RSDLite and the correct ATT ROM, but after the flash finished successfully and I insert a valid AT&T SIM, I still receive the same unlock message.
So my question is basically, can I get the phone completely back to being locked to AT&T, essentially the way it was out of the box? I'm also willing to flash it with Cyanogen or another ROM if that would help.
Any help is greatly appreciated, thanks for your time.
I have same issue, I had my Sim working for a couple of days but I wanted to return to stock to receive further updates and I flashed it with correct at&t firmware package but now there is a popup every time when I insert Sim about unlock code and I am stuck ... I think that's because of erasing modem st1 and modem st2 during flashing with RSDlite ... Is there anybody to suggest something helpful

Galaxy S6 relocked itself to T-Mobile after 7 months ?

Hi everyone,
I've been using an SM-920T 64GB Galaxy S6 bought from T-Mobile last summer. I did a permanent unlock using the T-Mobile application and since July I've been using the phone on the AT&T network. I just rebooted my phone today like I always do and upon restarting I got an "Invalid SIM Card" and it brings up a SIM network unlock PIN window that I can dismiss or enter a code into. What is going on?
I'm running XtreStoLite Deo 2.4 if that makes any difference.
Also, does anyone have the T-Mobile Device Unlock apk that comes stock with the phone? This is how I unlocked the phone in the first place but I don't have that app anymore since I run a custom rom, and the play store won't let me download it because I don't have a t-mobile SIM card in the phone.
Thanks!
Well for the benefit of whoever has the same issue. I flashed back the stock ROM via ODIN, ran the T-Mobile Device Unlock app, it said Unlock Unsuccessful in big, but right below it said the phone has been unlocked permanently. I put in my AT&T SIM and it was working again. Then I flashed back my TWRP backup and the phone remained unlocked. The non-Tmo ROMs get the unlock popup when a foreign SIM card is inserted, so getting an unlock code should work, but I didn't want to wait 3 days to receive one.
MrManH said:
Well for the benefit of whoever has the same issue. I flashed back the stock ROM via ODIN, ran the T-Mobile Device Unlock app, it said Unlock Unsuccessful in big, but right below it said the phone has been unlocked permanently. I put in my AT&T SIM and it was working again. Then I flashed back my TWRP backup and the phone remained unlocked. The non-Tmo ROMs get the unlock popup when a foreign SIM card is inserted, so getting an unlock code should work, but I didn't want to wait 3 days to receive one.
Click to expand...
Click to collapse
Can you tell me what ROM you used? I have the g920T also, and bought it USED unlocked from ebay, but it had the FRP (factory reset protection) lock on it. I had my US cellular SIM card in it, even though I was stuck at the "enter your previous used google account on this device" and the SIM seemed to work (saw the LTE bars above).
But the only way for me to bypass the FRP was to flash to the ROM to stock (which I used the G920T tmobile ROM) and I got to the home screen but now it says "Invalid SIM card. Network locked SIM card inserted" just how you were saying.
When I try using the Tmobile unlock app, it says "Server not responding. Please try again later." .
Please help!

fyi regarding sim unlock and rooting

Fyi if you root before you sim unlock tmobile says it locks out the app and you cant sim unlock it.ive been going round and round the last week with tmobile over this.they say it cant be sim unlocked because it shows in their system as rooted.even though i did a kdz restore on 20o the unlock app doesnt work and tmobile cant over ride it they said they tried and it failed.on the app i keep getting error device not recognized by your service provider call customer care
yes, this is true, i actually had very same issue, tmobile keeps telling me the device is not theirs because it is rooted lady said she tried to override but cannot get it through. ish i would have known this before rooting. is ther anyway we can trick it to look like it is not. i figured rooting would not matter as long as have stock rom. guess not
I rooted my device way last year when it was in 20N. I had it rooted and was able to unlock to phone. Was running stock at the time. This is kinda scary. Its also a shame really, maybe something tripped in 20o that detects root. Who knows.
Couldn't you just flash the 20o KDZ and get back to stock? Then unlock?
Stories said:
Couldn't you just flash the 20o KDZ and get back to stock? Then unlock?
Click to expand...
Click to collapse
your answer can be found on OP.
I have no problem to unlock with the app.
Mine is 100% stock rooted (with adapt client removed).
I revert to the 20i rooted by MicroMod777 (http://forum.xda-developers.com/tmo...-mm-20i-global-20e-stock-rooted-roms-t3317932) and then perform the Device Unlock app. It worked while I'm running that ROM, but once I revert back to CM13, it ask for a SIM network unlock PIN.
I contacted T-Mobile and has been stonewalled that they don't provide the SIM network unlock PIN.
I'm on rooted Extreme rom and I'm unable to unlock using Device Unlock app (Unlocked Failed: This mobile device is not eligible for unlock) despite TMobile said my device is eligible through multiple chat sessions.
Now I'm going to go back to stock and try again

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