hmmm. or a cheap Sprint phone for the boy to use on the cruise, and then convert it over to an emergency-only phone.http://www.kajeet.com/kajeetStore/serviceplans.do But it seems like it doesn't work with Verizon. Maybe you could sell the current Verizon phone and use the proceeds to buy a Sprint one?
edit: @APRIL LOL KAJEET
But my 12 year old with not 1, but 2 phones?