Basics
WHAT IS AN ESIM?
A SIM card built into your phone. No plastic, no swap, no kiosk.
Your phone has always had a SIM — a small chip that tells the network who you are. An eSIM is the same chip, but built into the phone at the factory. It's software, not hardware.
What that changes
You can buy a plan for another country and install it before you fly. When you land, you're online in seconds. No airport kiosk, no plastic tray, no lost SIM pin.
Which phones support it
Every iPhone since XS. Every Pixel since 3. Most Samsung Galaxy flagships since S20. If your phone is from 2020 or later, it almost certainly works.
Can I keep my regular number?
Yes. Your existing SIM stays active. The eSIM sits alongside it as a second line, just for data.