I would not recommend using your cell phone in another country period. I worked 5 years in collections for Cingular Wireless and saw firsthand how expensive this can be. People would be amazed that we charged them to use their phone in another country. Regulations, equipment, agreements are costly and therefore the consumer will pick up the tab if they insist on the luxury of using their cellphone internationally. Customers I have talked to would have a couple of thousand dollars worth of bills due to using their phones outside the US. When I was in Cancun I purchased a calling card for $20 and used it from my hotel when I needed to talk to someone back home. My boyfriend got the number of my hotel in Cancun and could call my room directly and would even leave notes at the front desk for me...in turn they would slide the note under the door of my room. No need for a cell phone y'all. Enjoy your vacation!!!