Can anyone help me with this? I'm running on an AT&T 16GB iPhone 4S, and want to purchase an iPhone 5 for AT&T. Now, as far as I know, I cannot use an early upgrade because I'm an added line onto someone else's contract, and if I early upgrade then my contract would exceed the account holder's contract. My idea now is to purchase an unlocked iPhone 5 and either see if AT&T can activate a nano sim with my account, or if worst comes to worst buy a sim card cutting too. Does anyone else have any other ideas? My apologies if this is in the wrong section or any other error is made, I'm new to this forum.