The quick verdict
An eSIM is the easy option. Note the UK left EU roaming, so check that a 'Europe' plan actually includes the UK.
Get an eSIM for United Kingdom ↗
Airalo sells a local United Kingdom eSIM — pick it on their store. Some links here are partner links: if you buy through them, Diaries of Travels may earn a commission at no extra cost to you. We only point to a service when it matches the advice on the page, and a commission never changes what we recommend. Disclosure →
What to expect
- Coverage
- The UK has excellent coverage in cities and good signal along main roads and rail, thinning in the Highlands.
- Networks
- Runs on EE, Vodafone, O2 or Three.
- Data for a week
- 5 GB for a week covers London and beyond comfortably.
- Good to know
- If you're doing the UK and the EU on one trip, pick an eSIM that explicitly lists both — many Europe plans now add the UK, but not all.
eSIM, local SIM or roaming?
For most trips to United Kingdom, an eSIM is the simplest choice: you buy and install it before you fly, then land already online. A local SIM can be cheaper for very long stays, but means queuing at the airport and sometimes registering ID. Your home carrier's roaming is the most expensive option and worth avoiding unless your plan already includes United Kingdom.
How to set up your United Kingdom eSIM
- Check your phone. It needs to be eSIM-compatible and carrier-unlocked. Most phones from the last few years qualify.
- Buy the United Kingdom eSIM before you fly, while you still have Wi-Fi at home.
- Install it over Wi-Fi. A one-tap install or a QR code adds it as a second line — your home SIM stays in place.
- Land and switch on. Turn on data roaming for the eSIM line only. It connects to a local network automatically.
- Keep your number. Leave your home SIM active for calls and texts, and use the eSIM for data.
One honest caveat
Coverage, plans and prices change, and networks vary by region within United Kingdom. Always download offline maps for anywhere remote, and check your phone supports eSIM before you buy.