No! This is the #1 roaming trap. Although it is a British Overseas Territory, the Cayman Islands is NOT part of the EU and is NOT included in any US or UK domestic plans. Most home carriers (like AT&T, Verizon, T-Mobile, or UK's Vodafone/O2) will charge you expensive international "Day Pass" rates (e.g., $10-$14 per day). A Cellesim eSIM is a one-time prepaid fee that is significantly cheaper.
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Is roaming free in the Cayman Islands with my US (AT&T/T-Mobile) or UK SIM card?
Updated April 22, 2026
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