For me the cell phone without internet is almost useless, not much I can do on it, might as well sue a purpose built device. They're also very cheap.
Even better if Nextel still worked on phones (but without service).
Projects like this one are a step towards fixing that. Personally I choose to keep both street and topographical maps of the entire continent locally on my phone. There are plenty of uses for a computer without a WAN connection.
And if nothing else, you can always rupture the battery and start a fire :-)
On the cruise I'd need to seek the written permission of the vessel's master's to operate :) (and ideally cruise company permission to even bring the transmitter on board)
Unlicenced passengers could probably plead ignorance and sneak UHF DMR radios.
Or get a business allocation and use P25 radios and once again plead ignorance :)