Wi-Fi and Cruise Ship
Some cruise ships now offer wi-fi, so, with an iPhone, you could use it. But, that means your phone is on, and airplane mode off. So, Edge could also be turned off to avoid data roaming, but wouldn't the phone incur roaming charges? Who knows...maybe someone here does.
Mac Mini / 4GB iPhone / 80GB iPod Classic, Mac OS X (10.4.10)