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London eSIM

100 United Kingdom plans · from $2.41

London is a contactless city — Tube gates, buses, cycle hire and half the museums expect a phone that works. A travel eSIM gets you through Heathrow and onto the Piccadilly line without hunting for a signal, and it sidesteps the £10-a-day roaming charges most non-EU carriers apply here.

Landing at Heathrow, Gatwick & Stansted (LHR / LGW / STN)

All three have free Wi-Fi in the terminals, but none on the Heathrow Express or the coach into town. Activating an eSIM before you fly means you have data for the whole transfer.

eSIM plans that cover London

London is covered by every United Kingdom plan below — there is no separate city-only eSIM to buy.

Choose a data plan

1 GB

Europe Extra only

7 days· 0.6 GB per $1

$2.41

★ BEST VALUE

Unlimited

Europe Extra only

1 days· ∞ GB per $1

$2.78

2 GB

15 days· 0.7 GB per $1

$3.64

3 GB

30 days· 0.8 GB per $1

$4.63

Unlimited

Europe Extra only

3 days· ∞ GB per $1

$5.93

5 GB

30 days· 0.9 GB per $1

$6.93

Unlimited

Europe Extra only

5 days· ∞ GB per $1

$9.36

10 GB

30 days· 1.0 GB per $1

$11.74

Unlimited

Europe Extra only

7 days· ∞ GB per $1

$12.72

Unlimited

Europe Extra only

10 days· ∞ GB per $1

$17.23

20 GB

30 days· 1.1 GB per $1

$20.21

Unlimited

Europe Extra only

15 days· ∞ GB per $1

$24.42

50 GB

30 days· 1.3 GB per $1

$44.36

Unlimited

Europe Extra only

30 days· ∞ GB per $1

$48.42

20 GB

Europe + USA only

60 days· 0.4 GB per $1

$51.36

100 GB

30 days· 1.3 GB per $1

$86.12

Which networks you'll be on in London

Siima eSIMs for the UK ride EE and Vodafone. EE has the largest 5G footprint in London and the better Underground coverage; Vodafone is strong across the city and better in parts of the south-east.

Coverage around London

The Underground

Coverage is now live on most of the Central, Northern, Jubilee, Elizabeth and Victoria lines, plus the ticket halls of nearly every station. Older deep-level sections of the Piccadilly and Bakerloo still drop between stations — download your route before you descend.

Zone 1 landmarks

Westminster, the South Bank, the City and the West End all have dense 5G. The Thames itself is fine — river bus routes keep signal the whole way to Greenwich.

Parks and open spaces

Hyde Park, Regent's Park and Hampstead Heath are well covered. The Heath dips slightly in the wooded northern section but never fully drops.

Day trips

Trains to Oxford, Cambridge, Bath and Brighton hold signal for most of the route, with the usual gaps in cuttings and tunnels.

How much data you need

A week in London is typically 3–5 GB — mostly Citymapper, contactless top-ups, and photos going to the cloud. Turn off automatic photo backup on mobile data if you shoot a lot.

Work it out with our data usage calculator →

Frequently asked questions

Does a UK eSIM work in Scotland, Wales and Northern Ireland?
Yes. Siima plans for the UK are country-wide and cover England, Scotland, Wales and Northern Ireland. They do not cover the Republic of Ireland — that needs an Ireland or Europe plan.
Will my eSIM work on the London Underground?
On most of the network, yes. Transport for London has rolled out mobile coverage across the majority of the Central, Northern, Jubilee, Victoria and Elizabeth lines and almost all station ticket halls. A few deep-level tunnel sections are still being fitted, so keep offline maps for those.
How do I set up an eSIM before arriving in London?
Install it at home while you still have Wi-Fi: open Settings → Cellular → Add eSIM and scan the QR code from your Siima confirmation email. Leave the line switched off until you land — the plan starts counting from first use in United Kingdom, not from purchase.
How much data do I need for a trip to London?
A week in London is typically 3–5 GB — mostly Citymapper, contactless top-ups, and photos going to the cloud. Turn off automatic photo backup on mobile data if you shoot a lot.
Is an eSIM cheaper than roaming in London?
Almost always. Daily roaming passes from most home carriers run $10–15 per day, while Siima plans covering London start from $2.41 for the whole trip. You also avoid per-megabyte charges if you exceed a roaming pass allowance.
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