To find the AT&T Wireless iPhone Forums, click here:
http://forums.wireless.att.com/cng/board?board.id=apple
If that link does not take you to the iPhone Forums, try this:
1) Find the iPhone page on ATT's wireless webpage.
2) Click on 'Get iPhone Support'
3) Under Customer Forums, Click on 'Go to Forums'
It should take you there 😉