More local reporting. I continue to be amazed that AT&T has such poor signal down the I-5 corridor. Folks may say it is "just me," but as I drove by the feed lots north of Coalinga, the signal was still a typical jumpy mess. Sometimes, it even read "no service," meaning no voice or data! After about 20 minutes of trying to let it find a stable spot, I gave up and went back to iPod. For those who might think that it is just the car, that seems highly unlikely. I have had the same results in a PT Cruiser and a Toyota Sienna - two vehicles with what I have to imagine are very different EM profiles.
Let's see if AT&T can improve this highly trafficked corridor.