What is an eSIM? Everything travellers need to know
An eSIM is a digital SIM card built into your phone. Instead of a plastic card you slot in and out, the profile is downloaded electronically and your phone connects to a network. No swapping, no tiny piece of plastic to lose, and no hunting for a paperclip to open the SIM tray at the airport.
For travellers that changes the arrival routine. Rather than queueing at an airport kiosk, adding a roaming bundle from your home network, or simply going without data, you buy a plan before you fly and you are online the moment you land.
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How does an eSIM work?
When you buy an eSIM plan you receive a QR code or an activation code. You scan it in your phone's settings and the profile downloads to the device. From that point the eSIM is ready, either straight away or when you arrive, depending on the plan.
Most phones store several eSIM profiles at once, though only one data profile is active at a time. That means you can keep a profile for each country you visit regularly and switch between them, and you can move between a travel eSIM and your home plan without losing either.
The underlying network is a local one. An eSIM is not a separate kind of signal, it is a different way of loading the credentials that let your phone use a normal mobile network in the country you are standing in.
Is my phone compatible?
eSIM is supported on most smartphones released from 2019 onwards, including:
- iPhone XS and later, including all current iPhones
- Google Pixel 3 and later
- Samsung Galaxy S20 and later
- Most recent iPads and Apple Watch models
To check on iPhone, open Settings, then General, then About, and scroll to Available SIM. To check on Android, open Settings, then Connections or Network, then SIM Manager.
Two things catch people out. Some devices sold in mainland China do not support eSIM even though the same model does elsewhere. And a phone still locked to a home network may refuse a travel profile, so check that it is unlocked before you buy.
Our eSIM device compatibility guide goes through this in more detail, model by model.
Why use an eSIM for travel?
- No roaming charges. A local or regional data plan replaces the roaming bundle from your home network.
- No SIM swapping. Your physical SIM stays in place, so you keep receiving calls and texts on your home number while the eSIM handles data.
- Set up before departure. Buy and install on home wifi, and arrive already connected.
- Multiple trips, multiple profiles. Store profiles for different countries and switch between them as your route changes.
The last point matters more than it first appears. The awkward part of arriving somewhere new is usually the first hour, before you have wifi, a local number, or a working map. An eSIM installed at home removes that hour.
Choosing between local, regional, and global plans
Most travel eSIM providers sell three shapes of plan. A local plan covers a single country. A regional plan covers a group of countries, which suits a multi-country trip. A global plan covers a wide list, which suits frequent travellers who would rather not think about it each time.
Which one fits depends on the route rather than the destination. A fortnight in one country points at a local plan. Three countries in the same region point at a regional one. Our local vs regional vs global eSIM comparison sets out how to pick between them, and how much mobile data you need for two weeks helps size the plan itself.
Getting your first travel eSIM
Airalo is a travel eSIM marketplace with plans covering a broad list of countries and regions. Search your destination, choose a plan that suits your trip length and data needs, pay in the app, and scan the code to install. The whole process takes a few minutes.
Install before you leave home rather than at the airport. The installation step needs an internet connection, which is exactly what you will not have on landing.
For step-by-step installation, see how to install an eSIM on iPhone. For destination-specific plans, our best eSIM for Japan guide shows the shape of the decision.
Frequently asked questions
What is an eSIM in simple terms?
It is a SIM card built into your phone as software rather than supplied as a plastic card. You download a profile instead of inserting anything, and the phone then connects to a mobile network normally.
Does an eSIM replace my normal SIM?
Not necessarily. Most modern phones run an eSIM alongside a physical SIM, so you can keep your home number active for calls and texts while the eSIM carries your data abroad.
Do I need to remove my physical SIM to use an eSIM?
No. That is one of the main advantages. Your physical SIM stays where it is, and you choose which profile handles data.
Can I install an eSIM before I travel?
Yes, and you should. Installation needs an internet connection, so doing it on home wifi means you land already set up. Many plans let you install in advance and start the data allowance when you arrive.
Will an eSIM work on a locked phone?
Usually not. A handset locked to a home network will typically refuse a third-party profile. Check that your phone is unlocked before buying a plan.
How many eSIM profiles can my phone store?
Most current phones store several profiles and let you switch between them, though only one data profile is active at a time. The exact number varies by model.
What happens to my eSIM when I get a new phone?
Profiles are tied to the device rather than to a tray you can move. Transferring an eSIM to a new handset depends on the provider and the phone, so check before you upgrade mid-trip.
Is an eSIM better than buying a local SIM on arrival?
It is usually faster and it removes the arrival queue, but a local SIM sometimes gives you a local phone number, which an eSIM data plan generally does not. Our eSIM vs SIM card comparison weighs the two.
Do I still need wifi if I have an eSIM?
Not for everyday use, though wifi is still worth using for large downloads. Our wifi vs mobile data abroad comparison covers when each makes sense.
Where should I start if this is my first trip with an eSIM?
Check your phone is compatible and unlocked, pick a plan shaped to your route, install it on home wifi before you fly, and keep the confirmation somewhere you can reach offline. Our connectivity checklist runs through the whole sequence.