I just got an i4 and love it. I gave my 3GS to my wife to use.. She is on her parents at&t family plan. She had a dumb phone and just transfered the SIM card to the iPhone. So far the text/phone calls/ WiFi works with no issues. She stays off Internet when she is on 3G. We noticed today that the phone on AT&T shows a 3GS now.... im guessing they know and theres a chance they will add a data plan but nothing has changed on features so far.. My question is, her family has the Unlimited Message plan that is shared across all lines (there are 5 phone lines) for $30.... If they make her add a Data plan, we can handle that but will they make her add a SEPARATE message plan because its an iPhone? Thanks for any help on this question!