eSIM.io
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eSIM.io, based in Portugal, introduced the OneSIM rechargeable balance model, which lets you maintain a single pool of funds across multiple trips rather than buying separate country packages. Coverage spans 200+ countries with data priced from €0.69 per GB.
Caribbean travelers who make repeat visits benefit from the persistent balance that doesn't expire, avoiding the waste of unused data bundles. The per-GB pricing offers flexibility for those whose data needs vary significantly between destinations.