CoreESIM services operate by connecting to terrestrial cellular networks. Therefore, your eSIM will provide data connectivity when your cruise ship is docked at a port in a covered country, such as Nassau or Cartagena, allowing you to connect to local carriers. However, CoreESIM does not support satellite-based maritime networks, meaning connectivity will not be available while the ship is sailing on the open ocean. Plan for shore-based usage accordingly.
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Will CoreESIM function on cruise ships or at sea?
Updated April 22, 2026
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