I frequent Cozumel Mexico to scuba dive and would like to use my Razr to call the states. I'm on a Cingular Nation plan now. Is it possible to purchase prepaid plans somewhere? Would it mean acquiring a different SIM card for use while there? Would I contact Cingular or would it require contacting a service in Cozumel? Sorry, the international thing relative to cell phones is beyond me. I was needing to buy another phone anyway so chose this one with it's quad bands thinking this would improve my chances of making it happen.