Wish I was still on the old AT&T Wireless, if only for better plans and ease of use. I like Cingular, don't get me wrong. Seems like they have the best deals and the best coverage area. I never have a dropped phone call and I can get service even in the hospital when others can't. I'm on the GSM/GPRS network though, not the old TDMA like I used to be. Ive noticed a big difference in the clarity of my calls.
Cingular customer service is getting better too. During the switchover from AT&T Wireless, they sucked. But I rode it out (and I had to, because I was in a 2 year agreement), and now they are MUCH better. I'll stick with them, only because all of the other services I know of suck worse. My partner has TMobile, and boy that service is BAD. He never has reception or we get dropped calls every time. Gotta get him on my plan when his is expired.
I love my fancy doohicky phone too (Motorola V551) - seems that Cingular has the biggest and best selection of phones. I've had to use it for data before when my comp was in the shop, and I was surprised at how cheap it was and how well it did (fast with the EDGE service that the phone comes with). Granted, it seems that mobile internet use has a long way to go.
And I get a discount because of my workplace, so with 1000 text messages, 450 minutes + 5000 night/weekend minutes, and all the little bells and whistles that come standard (and the rollover minutes!), it's a great deal for a total of $50 per month (that's with all the taxes and stuff too).