An eSIM is a digital SIM built into your phone. Instead of inserting a physical SIM card, you install a plan with a QR code — so travelers can keep their existing number (physical SIM) and simply add one more line for local data.
FAQ
What exactly is the difference between an eSIM and a physical SIM (USIM)?
A physical SIM is a small plastic card you insert into your phone, while an eSIM is a carrier profile installed as software onto a chip built into the phone. Switching lines on a physical SIM means swapping the card in and out, but an eSIM lets you add or switch lines just by scanning a QR code or entering a few details. Travelers usually keep their existing SIM (and number) as is and add an eSIM as an extra line for local data.
If I use an eSIM, can I still use my original number?
Yes. You keep your existing SIM (or eSIM) line as it is and add the travel eSIM as a second line. Calls and texts stay on your original number, while data runs on the travel eSIM.
Does any phone work?
It has to be an eSIM-capable model that is carrier-unlocked. Generally that means iPhones from 2018 onward and recent Galaxy and Pixel phones. A quick check: see whether your phone's settings have an "Add eSIM" option.
Can an eSIM be reused?
It depends on the product. If it supports top-ups (rebuying) or adding a new plan, you can keep using an eSIM you already installed; otherwise you install a new one. Plan expiry, deleting an eSIM, and transferring to another device are all different situations, so check the provider's guidance before buying.