What is an eSIM and how does it work?
An eSIM is a SIM built into your phone. The plan is downloaded to it over the internet, so you do not need a plastic card.
Updated 9 November 2026
What is an eSIM?
A traditional SIM card is a small plastic card that tells the network who you are. An eSIM does the same job, but it is a chip permanently fitted inside the phone.
That is why you can activate a plan by scanning a QR code. A phone can store several eSIMs, but usually only two plans are active at once. This means a travel eSIM does not replace your own plan, and your own number stays active. First check whether your phone supports eSIM.
eSIM and SIM card side by side
| eSIM | SIM card | |
|---|---|---|
| Form | A chip built into the phone | A removable plastic card |
| Activation | With a QR code over the internet | The card is inserted into the phone |
| Several plans | Several can be stored | One card per card slot |
| Delivery | Immediately after purchase | By post or from a shop |
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What happens when you set up an eSIM
You buy a plan
You get a QR code that contains the plan's download details.
The phone downloads the plan
You scan the code and the plan is saved on the phone. This needs an internet connection.
The network recognises the eSIM
When you arrive, the phone signs in to the local network and data starts working.
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Frequently asked questions
Is eSIM safe?
Yes. An eSIM is just as safe a way to use a plan as a traditional SIM card, and it cannot be lost in the same way.
Can an eSIM be moved to another phone?
Install a travel eSIM on the phone you will use it on, because it usually cannot be transferred to another device.
Do I need a new phone?
Not if your phone supports eSIM. Most iPhones from recent years and many Samsung and Pixel phones do. Search for your model on the eSIM phones page.
How do I set up an eSIM?
After purchase you get a QR code. You scan it in your phone's settings and the eSIM is saved to the phone within a few minutes. You can find the exact steps in the setup guides.