Not only are there data charges but they seem to be charging at a much higher rate than 30 cents per megabyte. I used to have Virgin and they charges $1 for 500KB or 24 hours whichever came first. I could check email and watch baseball on MLB.COM for 18-20 hours before using up 500KB.
On AMPD, I am being charged $0.20-$0.35 to just check email once or twice, maybe 10 minutes total browsing!!!