Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_1_3 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7E18 Safari/528.16)
When I did that last year I had to go to an AT&T store to activate that line. It kept trying to activate with the number it was purchased with, not the number I wanted to use.