I have to say, I'm an iPhone user living in Houston, Texas, and AT&T was just a little worse than my former carrier during normal times, but now that we're on a disaster recovery footing, their service stinks! Even two days before the storm, EGDE was unavailable for me to get traffic info like I always get before my return commute. There were also lots of dropped calls, calls whose service degraded until I couldn't understand what the other party was saying, and missed calls that never rang even though I had my phone. The only thing that kept reasonable service consistently throughout was SMS text. I guess that's to be expected during times like this.
It's all those Texas mountains blocking the signal.
What I really want is the ipod touch with GPS and force feedback for the keyboard. That's the killer device I'm waiting for Apple to bring to market. I don't want to pay "upkeep" for a portable usually-connected-online device.
It's a problem for every carrier.. I've been trying to call my friends on t-mobile and sprint, and have received the same issues. (I live in Austin, family in houston)