There's no onboard wifi — but most routes stay within cell signal range of Puerto Rico's coast, with some drop-off farther out toward Culebra, Vieques and the USVI.
The boats don't carry their own wifi hotspot — you're relying on your phone's cell signal.
Icacos and Palomino, both close to shore, tend to keep decent signal most of the trip.
Culebra, Vieques and USVI trips will likely see signal fade in and out at times.


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No, there's no onboard wifi — you'll be using your phone's own cell signal.
Generally yes, since both are close to the Fajardo coastline, though it can vary by carrier.
Expect it to be patchier and to drop out at times the farther from the main island you go.