Best eSIM for London: prices, data and how to set it up (2026)
A Slashtel eSIM for London costs from $2.59, with 7 plans from 1GB to 50GB, valid 7 to 30 days. Install it before you fly; it connects when you land at Heathrow (LHR), Gatwick (LGW), Stansted (STN) or Luton (LTN) on O2, Vodafone or 3 and works across the UK. Data only: your own number stays on your usual SIM for calls, texts and bank codes.
This is a data-only eSIM for London and the UK. You install it before your flight, and it starts working when you first connect in London. Plans range from 1 GB to 50 GB, valid for 7 to 30 days, from USD 2.59, and it connects to O2, Vodafone, 3 and EE with 5G.
London eSIM plans: the facts
| Price (USD) | Data | Valid for | Per GB | Networks | Hotspot | 5G |
|---|---|---|---|---|---|---|
| $2.59 | 1 GB | 7 days | $2.59 | O2, Vodafone or 3 | Yes | Yes, where available |
| $3.99 | 3 GB | 15 days | $1.33 | O2, Vodafone or 3 | Yes | Yes, where available |
| $3.89 | 3 GB | 30 days | $1.30 | O2, Vodafone or 3 | Yes | Yes, where available |
| $5.59 | 5 GB | 30 days | $1.12 | O2, Vodafone or 3 | Yes | Yes, where available |
| $8.89 | 10 GB | 30 days | $0.89 | O2, Vodafone or 3 | Yes | Yes, where available |
| $15.99 | 20 GB | 30 days | $0.80 | O2, Vodafone or 3 | Yes | Yes, where available |
| $31.49 | 50 GB | 30 days | $0.63 | O2, Vodafone or 3 | Yes | Yes, where available |
Prices checked 10 October 2026, all-in, no roaming charges. Networks and 5G are from our supplier's network list for the UK; the eSIM joins the strongest one automatically and speed depends on local coverage. Data only: no phone number, calls or SMS.
Which plan for your trip to London
| Trip | Maps, messages, light browsing | Social, video calls, hotspot |
|---|---|---|
| 1 week | 3GB · 30 days $3.89 about 3GB needed | 10GB · 30 days $8.89 about 7GB needed |
| 2 weeks | 5GB · 30 days $5.59 about 5GB needed | 20GB · 30 days $15.99 about 14GB needed |
| 1 month | 10GB · 30 days $8.89 about 9GB needed | 50GB · 30 days $31.49 about 30GB needed |
Live prices from our UK plans. Usage estimates: about 0.3GB a day for maps, messaging and browsing; about 1GB a day with video and calls.
How to set up your London eSIM
iPhone
- On Wi-Fi, open the QR email and go to Settings → Mobile Service (or Cellular) → Add eSIM → Use QR Code.
- Scan the QR and label the new line "Travel".
- Keep your usual line on for calls and texts; choose the Travel eSIM for mobile data.
- When you land in London, turn on Data Roaming for the Travel eSIM.
Android
- On Wi-Fi, go to Settings → Network & internet (Connections on Samsung) → SIMs → Add eSIM.
- Choose "Scan QR code" and scan the code from your email.
- Set the new eSIM as the SIM for mobile data; keep your usual SIM for calls and texts.
- When you land in London, turn on Roaming for the new eSIM.
Menu names vary a little by phone and software version. The QR works once: don't delete the eSIM after installing it. Full guide with screenshots · Check your phone supports eSIM
Getting online in London
- Install the eSIM on Wi-Fi before you fly, so it is ready when you land at Heathrow, Gatwick, Stansted or Luton.
- Turn on data roaming for the eSIM when you land, since it starts on your first connection in the UK.
- Keep your home SIM in the phone for calls, texts and one-time passcodes.
Other options
Other eSIMs, such as Airalo and Holafly, also cover the UK, and you can buy a local SIM at the airport with your passport. We publish every seller's price for the same data side by side: compare UK eSIM prices.
Travelling on from London? The same eSIM also works in Edinburgh, Manchester.