Had one. Returned it. Too many connection problems with AT&T... after four days they still had not figgered it out.
Check with the AT&T people in your error. They have a great number of Cingular towers to build, rebuild, or install. But They will usually tell you where the dopped call areas are currently, and when they expect to have them fixed. AT&T is spending a lot of money on it, but the FCC is very, very slow on approvals....