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More and more people are ditching carrier roaming in favor of travel eSIMs
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
The island is tiny, and only has about half a dozen houses on it. The visitors are there because it's a nature reserve, so generally don't want to be on their phones anyway. It's not worth setting up a relay station over just telling everyone before they get there.