You have to have it active on TMobile in order to request a sim unlock
Or you just try to search yourself and find this guide.
Yes. My device has been unlocked by TMobile and currently waiting for OnePlus to unlock the bootloader, for what I know it will take 7 days.
But I would like to know after unlocked the bootloader and what should I do? I wanna install to golbal version and I heard it able to use dul sim after it.
you can use fastboot rom from the guide section and flash that in fastbootd. its pretty easy to do. my 7t used to be on global but i returned to tmobile stock rom just for the google feed on the left instead of shelf. Before asking questions, just read a couple of pages back to avoid spamming the same questions others have had.
Should I back up some files in case some issues happen? Such as finger print doesn't work when the bootloader relocked? Because of I saw in other some pages in OnePlus 8 series.
i mean i havent backed up anything in relation to persist since ive also seen how to the fingerprint scanner is affected on the oneplus 8. i have relocked my bootloader on my 7t and the only thing not working is ota. i have no other issues besides that. fingerprint works fine after custom rom flashing and switching between global and tmobile stock rom. so id say you are fine since the msmtool does restore everything on the 7t. if you care about widevine level it'll return to stock if you go back to the locked bootloader state. also never re lock the bootloader when running anything custom to avoid issues(brick/bootloop).
I got problem today, but I'm not sure what's going on. I got my sim card in oneplus 7T and the device has been unlocked, the reason I said unlocked because of advance option show this device has been unlocked and able to use any of carriers, but there's no signal at all in my device. I switched the sim card to other phone and it's working, so I put my friend's sim card in oneplus 7T and it's working. Now I don't real understand why it's not working. When I got home and the device is working again.
Yes. I checked. This problem when I got home is solved, so I was thinking might be there's problem with signal at company but when I use my sim card in other phone from my friend, it doesn't have any problem.
