Before the iPhone launch, I mentioned I was selling my iPhone 3G about a week in advance and was going to put my SIM in an old Razr phone in between. There was a LOT of talk from a bunch of "chicken littles" who were saying that everyone who used another phone would have their unlimited data taken off their account by AT&T. Many said they had spoken to "some guy at AT&T" who assured them that this would happen, as the system does it automatically. Guess what? I still have unlimited data. Guess what else? So do all the other people. I'm not really just trying to gloat, but I'm trying to point out yet again that you can't trust employees to know what the hell they are talking about, and I'm also trying to point out that you can create all the doomsday disaster scenarios you want, but most of them won't come true. Anyone else NOT lose their unlimited data? How long did you use another phone?