Apple doomed themselves when they selected AT&T.
I live in the largest county in North Carolina and AT&T GSM coverage there is spotty at best. As long as you're alongside a major highway/road you're fine.
At least until you walk into your house and it goes down to 1 or 2 bars.
Just today at a family reunion a friend of mine remarked he was thinking about getting an iPhone when it launched. I told him to forget it since there was ZERO coverage within miles of his house where the reunion was.
He said "damn, guess I'm not getting one."
Apple should have hounded the crap out of AT&T to grow out their networks more.
I've even tried contacting AT&T to see if they want to slap a tower in a "dead zone" on our property towards the south but to no avail.
Only last week did they finally get around to changing the network name from "Cingular" to "AT&T" here in NC.
Pathetic.