I purchased my 3GS at launch, but my upgrade is still set to 2/20/11 so if it doesn't change till the 24th then I plan on using my moms upgrade so I can grab the IPhone 4 for 200. My question is about preordering through AT&T. I am on a family plan with my mom and what I plan to do is to preorder using my moms line, then when I get to the sales rep on the 24th I tell the sales rep that I will be using the IPhone and to transfer my number instead of my moms. Will doing this work out okay? I never preordered an iphone through at&t so I am unsure about the exact process. My mom is cool with it since I plan to give her my upgrade next year.