HT5014: iPhone: About unlockingLearn about iPhone: About unlocking
Currently Being ModeratedDec 11, 2012 11:08 AM (in response to dabhay)
Follow the instructions you were given by AT&T and restore the phone. You should get a message saying "Congratulations, your iPhone is unlocked".
Currently Being ModeratedDec 11, 2012 11:13 AM (in response to dabhay)
That email from AT&T should have said that it may take awhile (24hrs or so) from the receipt of that notice before a restore will give you the succesfully unlocked notice that KiltedTim mentions. Last one I unlocked it wasn't until a full 48hrs after the AT&T email that it worked (previous one had worked within 12hrs of the receipt of the email).