IPhones are tied to ATT/Cingular. They do work in Bze. If you don't call and have international roaming added to your account, the bill from BZE use might cause you a bit of a shock - but it will work irrespective. Also, if you leave the phone turned on and get calls that go to voice mail, you will be charged a roaming fee - even if you don't answer the call. On the upside, there is no charge for text messages.