http://forums.wireless.att.com/cng/board/message?board.id=international&thread.id=6928
Took me awhile to find this, so I thought I'd share with everyone. The real trick for me was the + sign bit. I couldn't figure out why my voicemail shortcut (press and hold "1") was working, but when I dialed it by hand it didn't work. Press * twice to get the + sign.
