What is an eSIM?
An eSIM is a SIM card built into your phone. Instead of inserting a physical chip, you download a small SIM profile to your device. Travel eSIMs use this technology: you buy a mobile data plan online, scan a QR code, and your phone can use mobile data in the country you are visiting, without a physical SIM card.
How does an eSIM work?
A traditional SIM card is a small plastic chip that identifies your phone on a mobile network. An eSIM does the same job, but the SIM profile is a piece of software installed over the internet.
For travel, this means you can buy a data plan before or during your trip, receive a QR code by email, and install it on your phone in a few minutes. Your phone can then use mobile data from the plan's network while your regular SIM stays active for calls and texts.
eSIM vs physical SIM
- A physical SIM has to be bought in person or shipped; an eSIM is delivered by email.
- A physical SIM occupies your SIM tray; an eSIM is installed in software and can sit alongside it.
- Installing an eSIM takes a QR code scan and a few minutes; swapping physical SIMs means carrying and not losing small chips.
- Both connect you to mobile networks: the difference is how they are delivered and stored, not how they perform.
eSIM vs roaming
Roaming means using your home carrier's partner networks abroad, and your home carrier bills you for it, often at much higher rates than at home. A travel eSIM is a separate data plan for the country you visit, paid once at a price you see before you travel.
We cover the differences, including costs and how calls and texts are affected, in our article on roaming before eSIM.
Advantages of travel eSIMs
- Buy online before you fly and install in minutes, no airport kiosks.
- Fixed, transparent pricing paid once, instead of unpredictable roaming bills.
- Your regular number keeps working on your physical SIM.
- Several eSIM profiles can be stored on one phone, useful for multi-country trips.
Limitations of travel eSIMs
- Your phone must support eSIM (most iPhones from 2018 onward and many recent Android models do).
- Most travel eSIM plans are data-only: they do not give you a local phone number for calls.
- The plan works in the destinations it lists; a single-country plan cannot be used elsewhere.
How to get a travel eSIM
Pick your destination, compare plans, and pay online. You receive the eSIM by email with a QR code and a step-by-step install guide. After installation, enable mobile data for the eSIM and it connects to a supported network on arrival.