Just shifted to T-Mobile from AT&T on iPhone 12 Pro Max. Carrier Lock reads, "SIM locked". Went to AT&T and got a PIN, but don't know what to do next so I can use the phone. Can anyone help, please.
iPhone X, iOS 14
Presumably AT&T was the original device-subsidizing carrier and locked your device to them. (this is a common practice, and not a punitive action based on your departure to a competitor)
If so, ONLY AT&T can unlock it.
See: How to unlock your iPhone for use with a different carrier - Apple Support
I suspect that AT&T simply gave you a SIM unlock PIN (or possibly a PUK) for your previous AT&T SIM.
Unfortunately, that is NOT what you need to release a Carrier Lock.
Even if you’ve met the necessary AT&T service obligations, you might find this “difficult going” as a non-current customer.
Presumably AT&T was the original device-subsidizing carrier and locked your device to them. (this is a common practice, and not a punitive action based on your departure to a competitor)
If so, ONLY AT&T can unlock it.
See: How to unlock your iPhone for use with a different carrier - Apple Support
I suspect that AT&T simply gave you a SIM unlock PIN (or possibly a PUK) for your previous AT&T SIM.
Unfortunately, that is NOT what you need to release a Carrier Lock.
Even if you’ve met the necessary AT&T service obligations, you might find this “difficult going” as a non-current customer.
shifting from att to tmobile iphone 12
