I don't know. It would have to depend on the 2 companies. My understanding is that each carrier has their own set of esn numbers and if there isn't a corresponding number in their system, the phone won't be allowed on their network. I could be wrong, but I think google is going to have to seel one's branded for each company (which them may lead each company to subsidize the phone unlike the n1 being offered 'compatible' with att)