I've never called someone on AT&T that the call quality doesn't suck, or get dropped. Landlines/Voip/CDMA calls are crystal clear. I don't know which way you're driving, but I drive from The middle of WV to Orlando all the time and the only time I have less than 5 bars is going through the 2 mile tunnel into VA, and even then I DONT DROP THE CALL, when any passenger with me with ATT looses signal.
FACT- All you're facts are based on YOUR opinion.
Edit-Not to mention the GSM interference with any audio equipment when the phone is about to ring, or is processing a lot of data.