A CoreESIM plan specifically provisioned for Saint Lucia is geographically restricted to its national boundaries. If you undertake ferry travel to Martinique, which is an overseas department of France (and thus part of the EU), your Saint Lucia eSIM will cease to function. Similarly, a ferry journey south to St. Vincent will also take you outside the plan's coverage area. For multi-island itineraries, CoreESIM advises securing a regional Caribbean eSIM plan that explicitly includes all intended destinations to maintain continuous connectivity.
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Is a CoreESIM Saint Lucia-specific plan valid for ferry travel to Martinique or St. Vincent?
Updated April 22, 2026
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