When I went in for the credit check yesterday, the guy tried to get me to set up service, and port my number to a free phone. He said that I could just return the phone and get the iPhone 3G on the 11th.
I was tempted for a second, but didn't feel right getting a phone with the intent to return it later. Plus, I can't see how returning a phone on the 11th would be any faster than setting up new service.