AT&T called me two weeks after I got my iPhone, said I had no data plan and needed to add one. Of course, I explained that I had a data plan, could not get out of the store without one. The rep said, yes that's right, but was having trouble making it retroactive. So... my bills shows up today with $724 in data charges for the first 13 days of the plan. Oops. But I called and they said they would fix it.