you mean to change the billing address on your AT&T account?
No, I think he means the billing address for your credit card information that you entered into Apple, nothing to do with AT&T. I think you had to have your address changed at AT&T before you did this in order for it to work.
i'm not changing mine.... i'm too much of a scaredy cat... took too much out of me yesterday to get the damned things ordered... i'll just stay home from work on the 24th! (the great american sick out... all caused by apple! )