I will be on a cruise in a couple weeks visiting a number of Caribbean ports. I am assuming Verizon does not have "normal" service in this area so I'm wondering how to set up my phone to avoid roaming changes. I want to use certain tools (like GPS, camera, text, games, wi-fi connections, etc.). I have no interest/need for using the phone. I just don't want to be surprised when I get home to find out there were large data charges incurred. Any advice for the settings I need?