Alan had AT&T, but recently switched to T-Mobile. He's thinking of getting his wife the Nokia Lumia 1020 or the Lumia 1520. Leo says both are beautiful phones, but T-Mobile doesn't offer the Lumia. Leo says that T-Mobile would let him bring in his own unlocked GSM phone, so he can go out and buy one unlocked and bring it to the service. He can have AT&T unlock his Samsung Galaxy S3 if he's in good standing. He'll want to be sure that the phones he wants to use are on the frequencies that T-Mobile supports.