Ok so a couple weeks before the iPhone 5 came out I bought a iPhone 4s..joined my wife's plan.. My first smartphone ever lol.. I love the phone. My wife has a iPhone 3s.. The phone is a year old and about 2 months ago she dropped her phone and cracked the screen..she is not eligible for an upgrade nor am I but I want the iPhone 5.. I'm wondering if I could hand my phone 4s down to her and I get a iPhone 5..will AT&T allow this??