Nothing, Apple wants the carriers to bid for their product and the highest bidder won.
If Apple thought they could make more money making phones for Verizon and ATT at the same time they would. Unfortunately their data shows if they do an exclusivity deal with the highest bidder they make more money.
Actually the story with the iPhone is that Apple initially approached Verizon who turned them away.
Doesn't matter to me that the iPhone won't be on VZW. I'm not a kool-aid drinker and I'm glad that data hogging iPhones will stay on AT&T.
I really think it came down to the control Apple wanted. Look at how much AT&T had to give up with the iPhone: OS updates, support, apps, voicemail, etc. Look at how VZW locks down their phones and tries to make everything VZW branded and it's clear they wouldn't be okay with the iPhone.
