A:AnswerWhoever answered this question previously is incorrect. By using your sim card from another I-phone from verizon/sprint or any other carrier that claims that are not cdma compatible will work as long as that sim card came in a phone from tgat carrier.
A:AnswerI was told that as long as it is truly a factory unlocked phone there is no problem with it working on any network that supports i phones. I have Metro PCS and it works fine.