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Know wether or not your cell and especially data plan supports roaming and in what countries. Fortunately, I can set my blackberry data plan to "off when roaming" so I don't have any accidents.
On cruise ships, its especially important to understand how this works. Especially if you have a teen or someone who doesn't realize that "unlimited" usually doesn't stretch outside your own border. You'll also recall that cruise ships charge by the minute, not the byte. So be careful to switch off your wifi on your laptop and avoid hooking up things like tablets and smartphones to wifi.