I think it's fairly obvious the technology among cell phone providers is different, but that does not mean a company like Verizon would be swayed from having interest in the iPhone and claiming part of the market share AT&T is currently enjoying. There is even talk out there as to a pre-paid iPhone plan. I just saw an
article today discussing an Apple and Verizon deal. There are several more out there. From what I have read, it can go two ways:
1. Apple wants more of the market share and will sign with Verizon after their exclusivity with AT&T expires next year.
2. Apple is using Verizon as a means of getting more from AT&T to keep them exclusive and Verizon will remain SOL.
Either way, it's feasible that Verizon could carry the iPhone. Consider as well that Verizon is boasting it's large 3G network and 4G network in the works so I don't think they will have a problem with potential drives of former AT&T customers coming over.
As far as service goes, I would like to get what I pay for. Since AT&T does not allow folks to just buy a data plan, I have minutes as well. I am unable to use these minutes from time to time as a result of dropped calls. So AT&T is interfering with my phone use regardless of what phone I have. I never recall having any issues whatsoever with Verizon phone service and expect more from a company that claims "more bars, more places".
I think if Verizon wants the iPhone enough and AT&T doesn't give Apple what they want, it will happen.