Need to unlock your AT&T iPhone? Here’s how:
The folks over at The Next Web were able to test this out and confirmed it. They say users must go to AT&T’s online chat. Apple actually does the unlocking. Know that it can also be done in-store.
You will need your Mobile Equipment Identity (IMEI) number. That’s under Settings>General>About on your handset.
You will get an unlock code from Apple within the next 72 hours via email, and you must do a backup and restore to complete the unlock. They will allow up to five devices to be unlocked per account. It’s also said that some users are having no problems whatsoever, and some are experiencing issues.
You can see a more detailed report here.