My gf is on a family plan with her parents through Sprint. She wants to get an Iphone 4 and her parents will switch to At&t as well...like a family plan. Can she not just walk into an At&t store and pre-order the phone and switch her parents over (the just want regular simple phones). Surely after the phone has been out A WHOLE MONTH...she won't have to wait another month to get the phone lol. Don't people get phones from Best Buy as well? What's the best and fastest way????