Most of my friends that have been on past trips have Nextel. The service was not very good. We stay at Island Club and when we were around the house in certain spots the service worked great but if you moved you lost the call. If you've ever seen the cell commericals where everyone is piled on a bench b/c that's the service spot, that was us only with a chair in the driveway in the one spot the phone worked. LOL!
Maybe others have had better luck.