The short version
An eSIM (embedded SIM) does the same job as a plastic SIM card, but it's a chip built into your phone. Instead of posting you a card, the network sends a digital profile that you install by scanning a QR code or tapping a button in an app.
Most phones can hold several eSIMs and switch between them in settings. That's what makes them so handy for travel: you add a cheap data plan for your trip, and your normal UK number keeps working alongside it.
Why travel eSIMs are cheaper
Travel eSIM companies buy data in bulk from local networks in each country and sell it to you as a simple bundle, such as 10GB for 30 days. Compare that with UK roaming, where the big networks charge about £6 to £8 a day outside Europe.
A week in Turkey on roaming can cost over £40. A 10GB eSIM for the same trip is often under £10. See the full roaming comparison.
eSIM plus points
- Buy and install before you travel, no airport SIM queue.
- Keep your UK number active for calls, texts and bank codes.
- Switch between plans in settings, no tiny SIM tool.
- Can't fall out or be swapped by a thief.
Which phones?
Most iPhones from the XS onwards, plus recent Samsung Galaxy, Google Pixel and many other Android phones. Check yours.
UK eSIMs
Most UK networks now offer eSIM for your main number too, including giffgaff, SMARTY, iD Mobile, VOXI and the big four. Compare networks.
Travel eSIMs
Data plans for a country or region, from providers like Airalo, Holafly, Saily and Nomad. Compare providers.
Common questions
Can I use an eSIM and a normal SIM at the same time?
Yes, on most phones that support eSIM. Keep your UK SIM for calls and texts, and use the eSIM for data.
Is an eSIM safer than a plastic SIM?
In one way, yes: a thief can't just pop it out of your phone. Transferring an eSIM usually needs your phone unlocked or an account login.
Can I reuse a travel eSIM?
Many providers let you top up the same eSIM on a later trip, which saves installing a new one. Check the provider's app.
More guides
How to set up an eSIM
Step by step for iPhone, Samsung and Google Pixel, plus the settings that stop surprise roaming bills.
How much data do I need?
Our calculator works out your monthly data, and how much you need for a trip.
How to avoid roaming bill shock
Ferries, Greek islands, North Cyprus and the other traps that catch UK travellers out.
Switch network and keep your number
The free text codes that make switching take one working day.