What is an eSIM and how does it work

A SIM card without the plastic. We explain what eSIM can do, what it cannot, and why it suits travel.

An eSIM is a SIM card built right into your phone. Instead of a plastic card, you “download” a carrier profile using a QR code or activation details. A phone can hold several profiles at once and switch between them in the settings.

Why it suits travel

You buy and install a foreign eSIM at home. After you land you switch it on and you are online, with no queue at an airport counter and no hunt for a shop. Your regular SIM stays on for calls and texts.

What an eSIM cannot do

• A travel eSIM is usually data only. It has no Czech phone number and no call minutes. You can call through WhatsApp, Messenger and similar apps.
• The phone must support eSIM and must not be locked to a carrier.
• A QR code can be installed only once. A deleted eSIM cannot be restored with the same code.

How to check that your phone has it

Dial *#06#. If an EID number appears, the phone supports eSIM. You can find a list of common models on the Compatibility page.