I pre-ordered black. I'm thinking of taking the unopened package to an apple store, check out the display models (black and white), and if I like white better then asking to swap my unopened black for an unopened white. Think this is possible on launch day without waiting in the iPhone buyer line? Also, would this require calling AT&T to activate since my number would be tied to the black phone I pre-ordered? Or would swapping with white carry the number to the new phone (seems it should)?