plan anymore? so i just got a new iphone. if i were to switch to my old blackberry later on, would at and t allow that and not charge me for the iphone data plan every month. id just tell them and switch the sims and use the iphone as a touch or not at all. im confused on if the iphone data plan has a two year contract or if its just required as long as the iphone is being used as a phone. please and thanks