Yesim

Yesim was founded in 2019 and has grown to over a million users by focusing on flexibility and pay-as-you-go pricing. Coverage spans 190+ countries including strong Caribbean options, and you buy data only when you need it. The app handles activation to balance management in one place, keeping things simple for travelers juggling multiple islands.

It works well for island hoppers and short-term visitors who don't want to commit to fixed plans or guess how much data they'll use. Compared to subscription-based eSIMs, Yesim's flexibility appeals to travelers whose connectivity needs vary day to day. The Swiss startup's rapid growth to a million users suggests their pay-as-you-go model resonates with modern travelers who value control.