Recently it became known about AT & T’s decision to independently unlock iPhones purchased from it. And today it happened ... It would seem - “the case is in the hat”, if not a few “but”.
First, the contract must expire and there should be no obligation on the “telephone”. Secondly, when I tried to unlock my stale “brick”, I was asked for the contract number from AT & T (it is indicated in the documents upon purchase). Therefore, if everything fits under the above points, then go to the AT & T website to release your devices! Here is an example of how to contact AT & T support ( www.youtube.com/watch?feature=player_embedded&v=GfUqTrZjxJc ).