After a somewhat disappointing announcement of the 3G data plans...I've made the decision to not buy the new iPhone. That being said, I am an existing AT&T customer. I do not own an iPhone. I would like to purchase the first generation iPhone (marketplace, ebay, friends, etc). If I do this: 1) Could I simply activate it with iTunes and add the $20 data plan? 2) Will I be forced to sign with AT&T for two years? 3) Will my current "unlimited text family plan" be applicable to the iPhone?