eSIM for cruise passengers.

Cruise passengers are simultaneously the demographic most likely to get accidentally billed four figures and the ones who benefit most from a good travel eSIM at ports of call. Every modern cruise ship has its own "Cellular At Sea" satellite network billed at extortionate rates — typically $7+/minute for voice and $0.50+/MB for data — and your phone will register on it the moment land coverage drops, with no warning.

A travel eSIM only helps when the ship is in port. Once you leave the harbour the cellular signal you are on belongs to the ship, not to any terrestrial carrier you have a plan with. The fix is the same protection a knowledgeable cruise passenger always uses: airplane mode at departure from every port, every time. Wi-Fi is fine to leave on, because the ship's on-board Wi-Fi (which you pay for separately) does not trigger the satellite billing trap.

For the typical 7-day Caribbean or Mediterranean itinerary that touches 4–6 ports, a short-duration regional plan covers shore excursions at all of them on a single profile. The Caribbean & Central America regional plan covers 15+ islands; the Europe regional covers Barcelona, Rome, Athens, Dubrovnik, Valletta, and most other Mediterranean cruise stops.

A useful mental model: the cruise is your hotel. You buy data for the destinations you visit, not for the hotel you sleep in. Just like you would not buy a roaming plan for a hotel's Wi-Fi, you do not need one for the ship's satellite network — that's the cruise line's problem to sell you.