I just bought a 1gen iphone and am debating just unlocking it so I don't have to sign a 2 year contract with at&t. I have a 40 dollar voice plan right and have no interest in data. I made the assumption I could just unlock my phone and swap in my sim card, but when I logged into AT&T they have a little section on the member home page that tells you the make and model of the phone that is active on your number at that time.. what will happen when I start using an unlocked iphone?