I managed to get in an order on Tuesday, so next Thursday I should be receiving my phone. I plan to sell my 3GS after I get the new one to finance the purchase. My question is: how do I get my old data on to the new phone and then completely erase everything on my old phone? Do I first connect the iPhone 4 to my Mac and follow the steps to activate it, and then re-connect my 3GS and do a "factory reset"? Or the other way around (i.e. first do a factory reset of the 3GS, then connect the iPhone 4). I want to make sure I don't lose any data, of course.