Travel eSIM or roaming?

Since 2017, EU and EEA contracts let you use your plan in other member states at no extra cost (“roam like at home”). Two catches: operators may apply a fair-use cap that is lower than your home allowance, and the rule covers only EU/EEA countries. Switzerland, the UK, Turkey, the Balkans outside the EU and everything further away are not included on most contracts.

Beyond the EU most contracts fall back to per-megabyte or per-day roaming rates, sometimes with a hard cap that cuts you off, sometimes without one. A week of maps and messaging can cost more than the flight. Day passes exist on some contracts but add up quickly on longer trips.

A travel eSIM is a second, prepaid line installed digitally on your phone. You pay a fixed price up front for a data amount and validity, nothing else is charged, and it sits next to your normal SIM. Your own number keeps working for calls and SMS, and the eSIM carries the data. No physical card, no shop, no registration queue at the airport.

Short trips inside the EU on a contract with a generous fair-use allowance; trips where you barely use data; or destinations where your contract genuinely includes roaming at no extra cost. If your home plan already covers it, keep it simple.

Any trip outside the EU/EEA; longer stays where the fair-use cap would run out; multi-country trips where a regional plan covers every border on one eSIM; and any time you want a known fixed cost instead of a bill that arrives after you are home.

Turn data roaming OFF on your home SIM and ON only for the travel eSIM. Otherwise some phones quietly route data over the home line when the travel line drops for a moment. Also disable automatic app and photo backups on mobile data if your plan is small.

iPhone XS/XR and newer, Google Pixel 3 and newer, Samsung Galaxy S20/Note 20/Z series and newer, and many recent Android phones. The phone must be carrier-unlocked. Check the FAQ or your phone settings (look for “Add eSIM”) before buying.