Have to put my $.02 in here.
AT&T cell service is absolutely horrible. (At least here in the Washington, DC region) I highly suggest going with another carrier as their customer service is terrible as well. I am counting the days down to April when my contract is up so I can switch to Verizon Wireless.
FWIW, they do not report to the CB unless you're late.
On a side note, on a trip to Pittsburgh over Christmas to visit the in laws, I noticed my cell phone worked in the Alleghany Mountain Tunnel the whole way through. Must be repeaters in there. I thought that was pretty cool.