Buy local data Sim cards, we did this in
France &
Spain. Approx 20€ a month for 150GB.
Italy is similar.
Portugal was 35€ for unlimited 4G data.
Networks are great along the coast. No booster needed.
The same might
work in the
Caribbean, especially in the French, Dutch, British or US associated islands.
Further out, as above, Starlink, but at much higher cost.