8.9 MB Sent
20.9 MB Received
New to iPhone and AT&T. Got it on launch day and have about 2 weeks left in my billing cycle. Am on wifi at home and work.
I put myself on the 200 MB because I figured with that much wifi access I could get away with it, and it seems that's the case. BUT, I really wish I could do unlimited, because I hate having to constantly watch and wonder. My wife is on the same plan, but some Hangman app she downloaded was using over 20 MB a day for a few days when she was away from wifi (it seems to connect to the Internet to get words), so we've removed it for now.
-HM