Over the years I've heard plenty of horror stories about travelers returning from cruises only to be hit by a jaw-dropping — and unexpectedly ginormous — cellular phone bill.
It's why I make every attempt to NEVER turn on cellular service on while aboard a cruise ship.
In March I spent a week aboard Windstar Cruises' Wind Surf on an otherwise splendid sailing in the Caribbean. During the trip I received a single text from AT&T informing me that I was nearing my data capacity for the month and, if it was exceeded, there would be a $20 fee for additional data usage. (I had purchased the ship's Passport Plan, which covers Wi-Fi but not cellular.) I had used my iPhone 7 on land during the trip and probably forgot to toggle the setting back to Airplane Mode when reboarding the ship a couple of times. In any case, I didn't intentionally use my iPhone on board Wind Surf for even a moment. That is, I uploaded no photos or video, texted no one, called no one.
So imagine my surprise when my AT&T bill arrived with an overage charge of $1,825!