After having an iPhone since day 1 for them, I'm leaving AT&T and their iPhone. I've spent 2 months trying out the Samsung Epic through Sprint and it absolutely blows the iPhone 4 away in a major way. Take that fact and add in that I get far better service (1 dropped call in 2 months as compared with a dozen or so a day with AT&T), and I'm gone. Everything the iPhone does, the Epic does better and faster. Places where my iPhone says "no service", I get full service with Sprint; who now also uses Verizon and T-Mobile towers.
About half of my phones are out of contract, so it's no big deal to move them now. The others I'll move over as their contracts expire. The real kicker is that, with my large family, I'll also save about $140 a month on billing besides having better service with a better phone!
I tried Verizon and they didn't cut it for me. I tried almost every phone Sprint had until I landed on their top phone, the Epic, and the learning curve was quick and easy. With the lower cost and the ability to do so many things the iPhone can't do, I forsee major problems for AT&T in the near future! In the last 2 days I received 23 emails on my iPhone that simply said "this message has no content" and each email came through just fine on the Epic with Sprint. I called AT&T and they said they were aware of the problem and are working on it. BS!! I've had that problem for months!!!! I wouldn't want to own stock in AT&T when people like me who have loved the iPhone try the Samsung Epic from Sprint. Buh bye AT&T!