Scott Moritz at The Street.com is predicting that AT&T will lose it's exclusivity on the iPhone next year to T-Mobile, not Verizon. Check it out here:
He discusses that Verizon is the number one network and that Apple shareholders will be disappointed with a deal with T-Mobile. But I think he's underestimating what a game changer the iPhone is. The iPhone has been a huge success, despite AT&T's overpricing for service (and service problems). T-Mobile, while in third place, has a good rep as a bargain phone service and very good customer satisfaction. Throw iPhone hardware on top of that and it might be a smashing success and give AT&T some much needed competition. Verizon might end up being the loser by waiting on the sidelines.