Traveling overseas usually means flying to a single country, and then using roaming or a local SIM card to provide data for your phone and tablet. If you’re a frequent, global traveler, Holafly wants you to try something completely new: a “subscription” eSIM that always lives on your phone.

The concept isn’t hard to grasp: If you’ve traveled to a country like Japan, you can buy a physical SIM card from a local provider that replaces your own, or tucks into a second SIM slot on a dual-SIM phone. However, eSIMs can replace SIMs as a downloadable authentication token that allows your existing phone to connect to the local network without roaming.

The drawback of both approaches is that one SIM or eSIM generally works in just one country. (Take a bullet train from England to France to Switze

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