Yes, for most of the journey. The ferry routes between the main islands (Piraeus -> Mykonos -> Santorini) are very busy and have excellent 4G coverage. While you may briefly lose signal in the deepest open water, you will be connected for 95% of your trip, allowing you to stream or browse while sailing.
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Will I have a signal on the Blue Star / Seajets ferry (while island hopping)?
Updated April 22, 2026
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