Ok, so I really want to switch to AT&T to get the iPhone 4, but I just can't bring myself to do it with either of the tiered data plans. I've been reading that if you sign up for AT&T and activate your SIM card through iTunes, it requires you to pick the unlimited data plan for the 2G. If I did this today, would I be able to have the unlimited data for the iPhone 4 or will they force the new plans since I only signed up a week ago?