When traveling by ferry to destinations like Naoshima or other remote Japanese islands, you'll find EastESIM provides strong signal at the departure and arrival ports, such as Uno Port or Takamatsu Port. However, as the ferry ventures into open sea, especially during longer crossings, connection may become intermittent or drop significantly. Our network partners, like NTT Docomo, maintain robust coastal coverage, but deep-sea conditions can challenge any mobile signal. It's a good time to enjoy the views!
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What is EastESIM's connectivity like on ferries to remote Japanese islands, such as Naoshima?
Updated April 22, 2026
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