High: 1.6mbps and higher
So if you can maintain 1.6mbps speed for an hour or more that is pretty good. I have not been to too many places on AT&T where I can get 1.6+ for an hour or more at a time. Quite often it is between 500kbps and 1mbps--at least in areas I want to use it most. I always seem to have better 3G connection speed when I don't need it--as in WiFi areas, including at my home.