Cell Phone Coverage Ratings

I have been a Cingular/AT&T subscriber for almost a year now. I love it. I've only had a handful of dropped calls, and that's because I was inside somewhere like Lowe's. I even get reception in Walmart, and a lot of places where other networks are dead. But, some other phones on my network get reception in places that I don't, so sometimes I think it's the phone and not just the network.