What is an eSIM?
An eSIM is a SIM card built into the phone. Instead of inserting a plastic card, you download a mobile plan onto a chip that is already inside the device. The "e" stands for embedded.
What changes compared with a plastic SIM
| Plastic SIM | A card you obtain, physically insert, and swap when you change plan. |
| eSIM | A profile you download onto the phone, usually by scanning a QR code. Nothing to receive, nothing to swap, nothing to lose. |
For a traveller, the practical difference is timing: a plan bought the night before a flight is on the phone a few minutes later. There is no shipping and no counter to find at the airport.
How you get a plan onto it
You buy a plan, receive a QR code by email, and scan it from your phone's settings. That adds a new line to the phone, alongside the SIM already there. The installation, step by step.
Two lines, one phone
Recent phones store several eSIM profiles and let you run one of them alongside your physical SIM. That is what makes a travel eSIM useful: your own number stays reachable for calls and SMS while the eSIM handles data at local prices.
What your phone needs
- eSIM support. Most phones released in recent years have it, but not all — and some regional variants of a model differ from others.
- To be carrier-unlocked. A phone locked to an operator will refuse a third-party eSIM whatever its hardware.
Both are worth checking before you buy anything: eSIM compatibility checker.