[Bossman]

I will not call it crappy AT&T coverage. This certainly sounds like, as already mentioned, your phone is NOT quadband. It's missing the 850 band that AT&T uses heavily.

My experience with my supposedly quandband dual-sim chinese phone is that, ONLY sim slot 1 on my phone has the 850 band. The sim slot 2 almost always latches onto tmobile regardless of the sim I put in it. I tested it with a number of reaming sims I have. When I put my AT&T sim in it, there was barely any signal.