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Do I lose the sim unlock when upgrading

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My Phone seems to be unlocked when I had Android 1.5 on it. When I switched it on I got the message I could upgrade to Android 1.6
Now it is asking for a network unlock code. So it is locked. Is this due the offical 1.6 upgrade or was it already locked on v1.5 which I basically couldn't test back then.
I never rooted this device, nor put alternative rom on it nor did anything "special"to it.

No, it should not. If you still have the unlock code you should try it.

protomanez said:
No, it should not. If you still have the unlock code you should try it.
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I haven't.I have to buy it.

Has anyone unlocked AND used a Custom ROM after?

Hi,
I need to unlock my device and my guess is I need to go back to Stock for the Tmobile Unlock App to work (does this even work in the first place?). So my question is has anyone used this successfully and also rooted/flashed another ROM after the unlock and it stayed unlocked?
If there are things I need to avoid after a successful unlock, please let me know that as well.
Thanks!

interesting

Well I know my N5 is unlocked under stock rom. After flashing a custom rom I lose the unlock. I've posted in other threads about this but there has not been a good answer other then getting an unlock code which I don't know how you would for tmo. But flashing an intl custom rom will let you get to the menu to enter the code to unlock. The question though is how and where would you get an actual numerical unlock code for a tmo device? Cellunlocker and a couple others I've contacted are not able to get an actual code to use for the tmo N5.

DriftorX said:
Well I know my N5 is unlocked under stock rom. After flashing a custom rom I lose the unlock. I've posted in other threads about this but there has not been a good answer other then getting an unlock code which I don't know how you would for tmo. But flashing an intl custom rom will let you get to the menu to enter the code to unlock. The question though is how and where would you get an actual numerical unlock code for a tmo device? Cellunlocker and a couple others I've contacted are not able to get an actual code to use for the tmo N5.
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Thanks for the response. Yeah, my phone needs to get unlocked cause I'm moving to Japan and I rather unlock it than buy a new phone...until the Note 8 comes out.
I tried to Odin back to stock, but I get a DRK fail so I can't lol

Moto G 7 Power - Is there a way to bypass Tmobile's unlock app?

I bought a Moto G 7 from T-Mobile 5 months ago, but now I'm travelling abroad and can't use any local sim card because its sim locked and T-Mobile's won't unlock it for me. Is there any way to bypass that application?
When I insert the new sim card I get a screen saying that I can unlock it remotely (it is denied on that app). All I need to how to type the code to unlock it.

Lol help me out on a code i broke my bold n1 couple weeks ago and have this g7 power its locked thru metropcs BUT the bootloader is unlocked and you can flash the latest "RETAIL" rom follow link mirrors.lolinet.com/firmware/moto/ocean/official/RETAIL/
And after flashin put your new carrier sim into phone then youl be prompt to type in network unlock code..
#helpyouhelpme lol

dxpeboiiii said:
Lol help me out on a code i broke my bold n1 couple weeks ago and have this g7 power its locked thru metropcs BUT the bootloader is unlocked and you can flash the latest "RETAIL" rom follow link mirrors.lolinet.com/firmware/moto/ocean/official/RETAIL/
And after flashin put your new carrier sim into phone then youl be prompt to type in network unlock code..
#helpyouhelpme lol
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PM me and I'll help you

MarceloNascimento said:
PM me and I'll help you
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I did id appreciate it alot

Hello. I`ll use this thread because of I have same issue. I flashed my metropcs with retail firmware and now it prompts me for code. Is it possible to be unlocked in that way?

So, just an update: I managed to replace the moto g power os, so now I have it debranded but it keeps asking for a code to unlock the sim card. I bought the Pantech UCC 2.0 (which was supposed to generate the code) but it didn't work. So now I'm looking for something to generate that code
If anyone got any tool or device that generates that for the moto g 7 power please let me know.

MarceloNascimento said:
So, just an update: I managed to replace the moto g power os, so now I have it debranded but it keeps asking for a code to unlock the sim card. I bought the Pantech UCC 2.0 (which was supposed to generate the code) but it didn't work. So now I'm looking for something to generate that code
If anyone got any tool or device that generates that for the moto g 7 power please let me know.
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I`m in the same situation. But I`m even not sure that will evade the original unlock app.

71evin said:
I`m in the same situation. But I`m even not sure that will evade the original unlock app.
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After the debranding (installing the original os) the unlock app is no longer avaiable, so I get the default window asking for the code. Thing is I don't have the code

MarceloNascimento said:
After the debranding (installing the original os) the unlock app is no longer avaiable, so I get the default window asking for the code. Thing is I don't have the code
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I mean I`m not sure that it is possible this phone to be unlocked by code since originally it is implemented to be unlocked by app.

I do believe it is possible since its the same screen I've seen on so many other apps. The unlock app was a mod Tmobile delivered with the version of the android operating system. When I replaced it, it went back to the default screen, so all I need now is a way to generate that code, it seems

Unlocking bootloader on ebay purchased TMobile 7 Pro

Thinking of buying one of these and want to clarify the process of unlocking the bootloader. From the ebay seller he says it is a T-Mobile phone but is sim unlocked already. He says I will have to contact oneplus to get the bootloader unlock code/token. I don't really want to wait the forty days or whatever I heard it was but it's ok as long as I can definitely get it unlocked eventually and won't be stuck for some reason with a locked bootloader. Thanks for any info you can provide.

https://forum.xda-developers.com/oneplus-7-pro/help/how-to-convert-tmobile-op7-to-t3935947

I've ran across two of your posts asking the same question. I had done the same thing as you. I bought an eBay sim unlocked op7p. At first I flashed the international firmware to just bypass the whole tmobile bootloader unlock. It worked in the sense that I was able to unlock the bootloader, however I had no service and the phone would not detect my sim (Cricket). I tried another sim with the same results. I had to use the msm tool and flash back to tmobile stock firmware in order for it to work with my sim.
I sent in my request for an unlock token and received it in 7 days. I think the 40 days is only for brand new phones. I would submit the unlock token request and go that route. YMMV, you may very well be able to flash the international software and just bypass it. I didn't have that luck. The 7 day wait wasn't so bad. Hope this helps.

devastatorx said:
I've ran across two of your posts asking the same question. I had done the same thing as you. I bought an eBay sim unlocked op7p. At first I flashed the international firmware to just bypass the whole tmobile bootloader unlock. It worked in the sense that I was able to unlock the bootloader, however I had no service and the phone would not detect my sim (Cricket). I tried another sim with the same results. I had to use the msm tool and flash back to tmobile stock firmware in order for it to work with my sim.
I sent in my request for an unlock token and received it in 7 days. I think the 40 days is only for brand new phones. I would submit the unlock token request and go that route. YMMV, you may very well be able to flash the international software and just bypass it. I didn't have that luck. The 7 day wait wasn't so bad. Hope this helps.
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That's good to know that I can get the unlock token if needed. So TMobile doesn't care who you are or that you don't have a T-Mobile account or live in US obviously then?

Reechings said:
That's good to know that I can get the unlock token if needed. So TMobile doesn't care who you are or that you don't have a T-Mobile account or live in US obviously then?
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The unlock code comes from OnePlus. I only had to wait the week and the received an email with a link to download the unlock_code.bin file. To answer your question, not to my knowledge.

devastatorx said:
I've ran across two of your posts asking the same question. I had done the same thing as you. I bought an eBay sim unlocked op7p. At first I flashed the international firmware to just bypass the whole tmobile bootloader unlock. It worked in the sense that I was able to unlock the bootloader, however I had no service and the phone would not detect my sim (Cricket). I tried another sim with the same results. I had to use the msm tool and flash back to tmobile stock firmware in order for it to work with my sim.
I sent in my request for an unlock token and received it in 7 days. I think the 40 days is only for brand new phones. I would submit the unlock token request and go that route. YMMV, you may very well be able to flash the international software and just bypass it. I didn't have that luck. The 7 day wait wasn't so bad. Hope this helps.
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I think I may be in the same boat. After fighting with msm I finally got it to flash the international firmware but nowjiy doesn't detect my sim. So you went back to Tmobile software and got the token to unlock but once you did that did you switch back to international or custom ROMs?

Duplicate post

Reechings said:
I think I may be in the same boat. After fighting with msm I finally got it to flash the international firmware but nowjiy doesn't detect my sim. So you went back to Tmobile software and got the token to unlock but once you did that did you switch back to international or custom ROMs?
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I have not flashed back to international because I couldn't get the phone to detect my sim even after updating the international firmware.
I would however recommend that once you flash back to TMobile (using msm) that you do the OTA (settings>system>check for updates)
Currently I'm running unlocked and rooted via magisk. I'd like to flash a custom rom (looking at resurrection) but they say to flash the international rom to both slots first (via recovery like twrp) and I'm not sure if that would cause the sim issue again. I haven't had time to ask about it (if I can flash straight from tmo stock rooted to a custom rom like resurrection). So unfortunately I don't have the best answer there. You may ask around in some of the custom rom threads about just flashing straight from the TMobile stock firmware with unlocked bootloader. If you happen to find out an answer, please pm me and let me know.

devastatorx said:
I have not flashed back to international because I couldn't get the phone to detect my sim even after updating the international firmware.
I would however recommend that once you flash back to TMobile (using msm) that you do the OTA (settings>system>check for updates)
Currently I'm running unlocked and rooted via magisk. I'd like to flash a custom rom (looking at resurrection) but they say to flash the international rom to both slots first (via recovery like twrp) and I'm not sure if that would cause the sim issue again. I haven't had time to ask about it (if I can flash straight from tmo stock rooted to a custom rom like resurrection). So unfortunately I don't have the best answer there. You may ask around in some of the custom rom threads about just flashing straight from the TMobile stock firmware with unlocked bootloader. If you happen to find out an answer, please pm me and let me know.
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Actually I was mistaken. Once I updated the international rom to Android Q my sim started working again and now I am on Bliss and sim is still working. Not sure what is going on with your sim.

SIM Unlock?

I've got a S7 that's happily running LineageOS 19, but I didn't realise the device was locked until switching network. I've got an MCK / NCK unlock code from eBay, however I just get "unlock unsuccesful" when entering. I've confirmed the IMEI I sent for the code is correct - the only thing I can think is that the custom rom might be causing problems but don't seem to be able to find similar threads on here. Do I need to go back to stock to remove the lock?

As suspected, needed to be downgraded to a rom based on stock and it then unlocked successfully.