I'm buying a buddy's 3G that is without a sim card to replace my stolen first gen iphone. I don't want to buy a new iPhone or pay for any subsidized phone that would lock me in with HORRID AT&T. Two questions: 1) Are the data plans the same from Gen 1 to 3G? In other words, can I just activate this new (to me) iPhone 3G on iTunes or do I need to let ATT know I have a 3g now? 2) If I cannot get hold of a sim card, will crappy ATT just give me a new sim without signing a new commitment? PS. The Find My Phone feature is cool. Watching my phone haul ass down the freeway was sickening. I messaged it offering a "reward if found" but no response so I had to remote wipe it. Wish I had put a lock on it, so I could have kept tracking it while not worrying that they could see my personal data.