They say existing customers can keep the unlimited data plan. However, I suspect they will eventually force me into one of their capped plans. Which is why, as much as I love AT&T, I am not going to renew my contract for any reason. I am under contract until Oct 2011. If they push me into one of those bogus capped plans, I will change carriers. Even if it means switching to the inferior CDMA network. If I can I will take my iPhone to T-Mobile. If I can't, Sprint's 4G network will likely be in full force by then.