Should I use an eSIM when travelling abroad?
An eSIM is a SIM built into the phone and activated by download rather than a physical card. For travel it is usually the cheapest and most convenient way to get data abroad, provided your phone and your account support it.
The advantages are straightforward. You buy and activate a local or regional data plan before you leave, so you have connectivity the moment you land rather than hunting for a shop. Most phones let an eSIM run alongside your existing SIM, so you keep your home number for calls and messages while data runs over the cheaper plan. Nothing physical can be lost, and switching plans between countries takes a couple of minutes.
The limitations are worth knowing before relying on one.
Not every phone supports it, and some regional variants of otherwise-compatible models do not.
Your phone must be carrier-unlocked, or the eSIM will not activate.
Most travel eSIMs are data-only. You get no local phone number and cannot make ordinary calls or receive SMS on that plan. This matters more than people expect, because many services — including bank verification and some taxi apps — send SMS codes. Keeping your home SIM active for incoming SMS solves it, but check what your home operator charges for that.
Coverage depends on which local networks the provider partners with, which varies by country and is worth checking against where you are actually going.
Activation usually needs internet, so install it before you travel.
Compare against your home operator's roaming bundle — for short trips within some regions, roaming is already included and an eSIM saves nothing.