What is an eSIM and how does it work?

Updated 9 November 2026

An eSIM is a SIM card that's built into your phone instead of being a plastic card you slot in. You download your mobile plan to it, so you can add a plan for a trip in a minute, before you leave home. Here's how it works, and when it beats a regular SIM.

What “eSIM” means

eSIM stands for embedded SIM: a small chip soldered inside the phone. It does the same job as a SIM card, identifying you to a mobile network, but the details of your plan (the “profile”) are downloaded rather than printed on a card.

The chip is rewritable and can hold several profiles, for example your home number and a travel data plan. You can switch them on and off in your phone's settings.

How an eSIM works

You buy a plan from a mobile operator or an eSIM provider.
You get a QR code, a one-tap install link or an activation code.
Your phone downloads the profile over Wi-Fi from the operator's secure server. It uses a GSMA standard shared by phone makers and operators worldwide.
The new line appears in your settings next to your usual SIM. Switch it on and your phone connects to the operator's network, exactly as it would with a physical card.

eSIM vs physical SIM

	Physical SIM	eSIM
What it is	A removable plastic card	A chip built into the phone
How you get it	In a shop or by post	Downloaded in a minute
Plans on one phone	One per SIM slot	Several stored, usually one or two in use
Switching to a travel plan	Swap the card, keep the old one safe	Turn a line on in settings
If the phone is lost	The card can be taken out	Nothing to take out
Networks and speed	The operator's network	The same network and speed

Which phones have an eSIM

Every iPhone from the XR and XS (2018) onwards, most Samsung Galaxy S and Z models from recent years, Google Pixel phones and many other recent Android phones. iPhones sold in the United States since the iPhone 14 have no SIM tray at all.

The quickest check: dial *#06#. If you see an EID number, your phone supports eSIM. It also needs to be unlocked, not tied to one carrier.

Why eSIMs suit travel

You can buy and install a travel plan at home, so you're online the moment you land, with no airport queue for a local SIM. Your own SIM stays in the phone, so calls, texts and bank codes keep reaching your usual number while the eSIM handles data.

The trade-offs: most travel eSIMs are data only, with no local phone number, and moving an eSIM to a new phone takes a transfer step rather than just moving a card.

Questions

Is an eSIM the same as a virtual SIM?

People often use the words for the same thing. Strictly, an eSIM is a real chip inside the phone; only the plan on it is digital.

Can I use an eSIM and a physical SIM at the same time?

Yes, on most phones. Keep your usual SIM on for calls and texts and choose the eSIM for mobile data.

Does an eSIM work everywhere?

It works wherever the plan's operator has a network or a roaming partner. A travel eSIM lists the countries and networks it covers.

Do I need Wi-Fi to install an eSIM?

You need an internet connection to download the profile, so install it at home or on hotel Wi-Fi before you need it.