The UK has excellent mobile coverage across England, Scotland, Wales and Northern Ireland. An eSIM is ideal for visitors wanting reliable data in London and beyond.
Updated March 2026
UK 3GB — 3 GB
Airalo offers the cheapest UK eSIM with coverage on EE or Three networks. Great for visitors who need reliable data across England, Scotland and Wales.
Get this dealSide-by-side comparison of the best eSIM deals for United Kingdom. Sorted by price.
| Provider | Plan | Data | Validity | Price | Price/GB | Network | |
|---|---|---|---|---|---|---|---|
| Best Deal Airalo | UK 3GB | 3 GB | 30 days | £4.50 | £1.50 | EE / Three | View |
| Airalo | UK 10GB | 10 GB | 30 days | £11.00 | £1.10 | EE / Three | View |
| Holafly | UK Unlimited | Unlimited | 7 days | £19.00 | N/A | Three | View |
| Saily | UK 5GB | 5 GB | 14 days | £6.99 | £1.40 | EE | View |
| Ubigi | UK 3GB | 3 GB | 30 days | £8.00 | £2.67 | EE | View |
| MobiMatter | UK 5GB | 5 GB | 14 days | £7.50 | £1.50 | Three | View |
Common questions about using an eSIM in United Kingdom.
Airalo offers the cheapest UK eSIM at £4.50 for 3 GB with 30-day validity on the EE or Three networks.
Yes, much of the London Underground now has mobile coverage. If your eSIM uses the EE or Three network, you should have signal on most Tube lines, especially the newer sections.
Yes, UK eSIM plans cover England, Scotland, Wales and Northern Ireland. Coverage in major Scottish cities like Edinburgh and Glasgow is excellent. More remote Highland areas may have weaker signal.
If you are only visiting the UK, a UK-specific eSIM is usually cheaper. If your trip also includes European countries, a regional Europe plan can save money versus buying separate plans.
For a week in London with regular use of maps, the Tube, social media and messaging, 3 GB is usually sufficient. London also has free Wi-Fi on many buses and in cafes.