Customers who do order(and who pre-order) will receive a call from AT&T when your iPhone 4 is ready for pick up. They do not want customers to camp out or stand in line in front of their stores because they do not want dissappointed customers.
[ame]http://www.youtube.com/watch?v=WKlLb_EWaSI[/ame]
For all you people who didn't pre-order, camping out in front of the Apple store is your best bet.
Good Luck.