How exactly does preordering work? I understand that you either preorder through ATT or Apple and you can have the phone either be shipped to your house or picked up at the store. I assume that if you choose to have the phone shipped to your house, activation occurs when you hook up the phone to iTunes. How do you get to choose your plans now, though? I'm a returning customer looking to keep my Unlimited Data plan. I'm worried that when I hook up my new phone to iTunes, I'll only be presented with the two new data plans as options. How did this work for the 3GS?