My wife upgraded her phone and switched from AT&T to Verizon. I would like to use her old phone with is a 3G but the kid at the store said that it will only work with AT&T. I sure that he does not know if that is true, but is only interested in selling new equipment. How can I go about switching the old phone so it will work on Verizon. Will replacing the simm card take care of the sitch? Where do you get a new simm card? I am new at most of this phone stuff so any help is appreciated.