1 · The short answer

Every travel eSIM sells London as part of its United Kingdom plan. We priced the six that get most of the traffic on the same day, for a long weekend, a week and two weeks with day trips out of the city, and looked at what your phone has to do between the airports, the Tube and the streets.

OUR PICK
✓Cheapest unlimited for a week or more in London

Unlimited data for 2 weeks at $14.99, less than any rival here charges for 7 days. 30 days at $26.99. Nothing renews.

Nomad
✓Cheapest long weekend

3 days of unlimited at $11. Ringo Light sells no 3-day plan.

Ubigi
✓Cheapest bucket, and the most full speed data in a month

10 GB for 30 days at $11, and unlimited for 30 days at $44 with 60 GB at full speed, then 2 Mbps.

Holafly
✓Simplest unlimited

Days, not gigabytes, no daily cap stated for your own phone. $27.50 for a week; sharing limited to 1 GB a day.

A week of unlimited data for London
$14.992 weeks29% less
Next cheapest: Ubigi at $21.00, 7 days
A month of unlimited data for London
$26.9930 days39% less
Next cheapest: Ubigi at $44.00, 30 days, 60 GB at full speed

Prices read on 26 September 2026: Airalo, Holafly, Saily, Nomad, Ubigi on their own sites or listings, Ringo Light from its catalogue. All in US dollars unless stated. Treat every number as a snapshot.

See the full price index for every country.

Travelling further? Compare the eSIM for Europe and the best eSIM for Europe, all brands priced.

2 · The prices, charted

A week of unlimited data for London

US dollars, 26 September 2026. Ringo Light sells 2 weeks, the nearest length it has.

$14.99 · 2 weekscheapest
Ubigi
$21.00 · 7 days
Nomad
$25.00 · 7 days
Airalo
$27.00 · 7 days
Holafly
$27.50 · 7 days
Saily
$28.99 · 7 days
A month of unlimited data for London

The 30-day unlimited plan at each brand. Ringo Light is unlimited data at full speed.

$26.99 · 30 dayscheapest
Ubigi
$44.00 · 30 days, 60 GB at full speed
Nomad
$49.00 · 30 days
Airalo
$69.00 · 30 days
Saily
$71.99 · 30 days
Holafly
$73.90 · 30 days
10 GB for 30 days for London

The bucket most people buy for a two-week trip. Holafly sells no buckets. Ringo Light sells no bucket either: its 2 weeks is unlimited and lasts 2 weeks, not 30 days.

Ubigi
$11.00 · 30 dayscheapest
$14.99 · 2 weeks, unlimited
Nomad
$17.50 · 30 days, from
Saily
$18.99 · 30 days
Airalo
$19.00 · 30 days

3 · Side by side

Swipe to compare →

AiraloHolaflySailyNomadUbigi
ModelBuckets or unlimited daysUnlimited days onlyBuckets or unlimited daysBuckets or unlimited daysBuckets, unlimited, or monthlyUnlimited trips: 2 weeks or 30 days
Unlimited, 3 days$11.50$11.90No 3-day plan$11No 3-day plan; 1 day $5No 3-day plan
Unlimited, 7 days$27$27.50$28.99$25$21No 7-day plan; 2 weeks $14.99
Unlimited, 30 days$69$73.90$71.99$49$44$26.99
10 GB, 30 days$19No buckets$18.99$17.50 to $19$11No buckets; unlimited 2 weeks, $14.99
20 GB, 30 days$31No buckets$30.99$25 to $2625 GB $22No buckets; unlimited 30 days, $26.99
Full speed on unlimited3 GB a day, then about 1 MbpsNo daily cap stated; sharing 1 GB a day5 GB a day, then 1 Mbps2 GB a day, then slower25 GB a week or 60 GB a month, then 2 MbpsUnlimited data at full speed
NetworksEEEE, O2, Three, Vodafone, Orange UK listedNot namedThree, EE, VodafoneEE, ThreeLocal partner network
Renews?NoNoNoNoMonthly plans doNo; the trip ends when it ends
App neededYesYesYesYesYesNo, the eSIM arrives by email

Get Ringo Light for London, from $14.99.

Installed once, next to your own SIM. Your eSIM arrives by email in seconds.

Loading plans for this destination.

We sell data eSIMs for now to fund the full Ringo service. Ringo is self funded. Every plan bought here pays for the build of one plan that works everywhere.

Want to keep your own number abroad?

The full Ringo service

That is the full Ringo service: one plan that works everywhere, with your own number included.

It is a separate product from Ringo Light and it is still being built, so it is not on sale yet. Join the waitlist to hear when it opens.

4 · What to do in London, and what your phone does for you there

Seven places for a first visit to London, from Westminster to Oxford. All are on the Tube, the Elizabeth line, the river boat or a train, with good 4G and 5G above ground.

Big Ben and the Houses of Parliament, Westminster
WestminsterBig Ben and the Houses of ParliamentThe clock tower and the Gothic palace on the Thames, best seen from Westminster Bridge or the South Bank. Come at dusk when the tower lights up.✓Tap your phone or contactless card at the Westminster Tube gates; the daily fare caps itself.Photo: Colin, CC BY-SA 4.0
Tower Bridge and the Tower of London, Tower Hill
Tower HillTower Bridge and the Tower of LondonThe Norman fortress that holds the Crown Jewels sits beside the bascule bridge from 1894. Walk the bridge after the Tower and cross to the south bank.✓Book Tower tickets on your phone before you go and show the QR code at the gate.Photo: Dietmar Rabich, CC BY-SA 4.0
Tate Modern, Bankside, South Bank
Bankside, South BankTate ModernModern and contemporary art in a former power station on the Thames. Entry to the main collection is free, and the viewing level gives a wide view over the river.✓Special exhibitions need a ticket, so book on your phone. The Millennium Bridge links the museum to St Paul's on foot.Photo: King of Hearts, CC BY-SA 4.0
Cutty Sark and Greenwich, Greenwich
GreenwichCutty Sark and GreenwichA tea clipper from 1869 in dry dock beside the Thames, with the Royal Observatory and the Prime Meridian up the hill in the park.✓Take the river boat from central London and plan the return in Citymapper; the DLR and trains also reach the area.Photo: mattbuck (category), CC BY-SA 4.0
Richmond Park, Richmond, south-west London
Richmond, south-west LondonRichmond ParkA royal park of grassland and woods where red and fallow deer roam freely. It is the largest of London's royal parks.✓Signal can be patchy in the middle of the park. Save an offline map before you walk in.Photo: Emőke Dénes, CC BY-SA 4.0
The Tube, Across London
Across LondonThe TubeThe oldest underground railway in the world, opened in 1863, and the way most visitors cross the city. It is busiest at rush hours in the morning and early evening.✓Save your route in TfL Go or Citymapper before you go down, as signal on older lines can drop between stations.Photo: Acabashi, CC BY-SA 4.0
Oxford and the Radcliffe Camera, Oxford, day trip
Oxford, day tripOxford and the Radcliffe CameraThe domed library in the heart of the old university city, about an hour from Paddington by train. Cambridge, from King's Cross, makes a similar day.✓Buy a train e-ticket in a rail app, off-peak is cheaper, and keep it on your phone for the gate.Photo: Julian Herzog (Website), CC BY 4.0

5 · Getting online at Heathrow, Gatwick, Stansted and Luton

London has four main airports and all have 4G and 5G in the terminals. Switch your eSIM on when you land, so your phone is online before passport control and your ticket app is ready on the train. Heathrow is on the Elizabeth line, the Heathrow Express and the Piccadilly line. Gatwick has trains to Victoria, London Bridge and St Pancras. Stansted has the Stansted Express to Liverpool Street, and Luton has a shuttle to Luton Airport Parkway station for trains to St Pancras.

You do not need a paper ticket for the Tube or the Elizabeth line inside London. Tap a contactless card or a phone at the gate. Trains from the airports are sold in rail apps or at the station, and the e-ticket stays on your phone.

6 · Signal on the Tube and the Elizabeth line

The Elizabeth line has mobile coverage in its stations and tunnels. On the older Underground lines, 4G and 5G has been added at a growing number of stations and tunnel sections, but not everywhere, so a stream or a call can still drop between two stations.

Citymapper and the TfL Go app plan journeys across the Tube, the Overground, buses and the river. Save your route or your hotel address for offline use before a day out, so nothing depends on signal underground.

7 · Cards, contactless and your phone

London runs on contactless. Tube, Elizabeth line, Overground and bus fares are paid by tapping a card or a phone, and the daily fare caps itself. Use the same card or phone every time, as a second card counts as a new journey. Most shops, pubs and cafes take cards and phone payments, so you rarely need cash.

Oxford and Cambridge are each about an hour from the city by train, and Brighton is about an hour from Victoria or St Pancras. The United Kingdom plan covers all three, so there is nothing to switch on the way.

8 · Which plan fits a London trip

A long weekend: Nomad sells 3 days of unlimited data at $11, the cheapest here. Ringo Light sells no 3-day plan, so for two or three nights Nomad is the better buy.

A week: A week of unlimited costs $21 at Ubigi, $25 at Nomad, $27 at Airalo, $27.50 at Holafly and $28.99 at Saily. Ringo Light sells no 7-day plan, but its 2 weeks of unlimited data costs $14.99, less than any of those weeks. You simply have days left over.

Two weeks or a month: Ringo Light 2 weeks at $14.99 or 30 days at $26.99. Both cover the whole United Kingdom, London included, with nothing to change when you leave the city. Ubigi at $44 for 30 days is the nearest rival, and it caps full speed at 60 GB.

9 · If you want a data bucket: Ubigi, then Nomad

  • Ubigi, $11 for 10 GB. The cheapest 10 GB by a distance, enough for maps, messages and a few photos a day.
  • Nomad, $17.50 for 10 GB. Its price moves with sales, $17.50 to $19 the day we looked, and 20 GB at $25 to $26 is the cheapest 20 GB here.
  • Saily, $18.99 for 10 GB, and Airalo, $19. Both sit close together on price, with an app for top-ups.
  • ✓Ringo Light, no buckets. Our 2 weeks is unlimited for $14.99. Buy ours for unlimited, not as a bucket.

10 · What Ringo Light is

Ringo Light is our own data eSIM, sold to fund the full Ringo, one plan that works everywhere with your own number ported onto it. For the United Kingdom, London included, it sells two trips, both unlimited data: 2 weeks at $14.99 and 30 days at $26.99. Nothing renews. Fair use policy, see Terms. The eSIM arrives by email and installs in one scan, no app.

The card to buy it is further up this page, just after the side-by-side table.

11 · Pick by trip

A long weekend in London

Nomad unlimited, 3 days, $11. Ringo Light sells no 3-day plan.

A week in London

Ringo Light unlimited, 2 weeks, $14.99, less than a 7-day plan at Ubigi ($21), Nomad ($25), Airalo ($27), Holafly ($27.50) or Saily ($28.99).

London, Oxford, Cambridge and Brighton

Ringo Light 2 weeks at $14.99 covers the whole United Kingdom.

A month, working from a cafe

Ringo Light unlimited, 30 days, $26.99, no app to install.

Maps and messages only, for a month

Ubigi 10 GB for 30 days at $11.

12 · Frequently asked questions

What is the best eSIM for London?+
For a week or more, Ringo Light: unlimited data for 2 weeks at $14.99 or 30 days at $26.99, priced on 26 September 2026. For 3 days, Nomad at $11. Every brand here sells one United Kingdom plan that covers London.
Does my phone work on the London Underground?+
On the Elizabeth line, yes, in stations and tunnels. On the older Tube lines, coverage is at a growing number of stations and tunnel sections, but not everywhere, so save your route and maps offline.
How do I get online at Heathrow?+
Install the eSIM before you fly, then switch it on when you land. Heathrow has 4G and 5G in its terminals, and the Elizabeth line and the Heathrow Express run into central London.
Do I need an Oyster card in London?+
No. Tap a contactless card or a phone at the gate; the fare caps itself each day. Use the same card or phone for every journey.
Is one eSIM enough for London and a day trip?+
Yes. The plans here cover the whole United Kingdom, so Oxford, Cambridge and Brighton use the same eSIM as London.
Is unlimited data really unlimited in London?+
Every brand has a limit somewhere. Airalo slows you after 3 GB a day, Saily after 5 GB, Nomad after 2 GB, Ubigi after 25 GB a week or 60 GB a month. Holafly states no daily cap for your own phone. Ringo Light is unlimited data under a fair use policy, see Terms.
Can I keep my own number on a London travel eSIM?+
No. All six sell data only. The full Ringo, which Ringo Light funds, ports your existing number onto one plan that works in the United Kingdom and 180 other countries.

13 · How we compared, and our sources

We priced Airalo, Holafly, Saily, Nomad, Ubigi and Ringo Light for London on 26 September 2026, all on the same day, in US dollars. Each rival's price comes from its own website where it showed dollars, otherwise from an esimdb.com listing, and every source and its date is listed below. Ringo Light's prices come from the catalogue our checkout charges.

We compare the trips people actually book: a week, two weeks and a month of unlimited data, and a 10 GB bucket. We read each brand's fair use and speed rules and quote them as the brands state them. We did not run speed tests, so this page makes no speed claims for any brand.

Ringo Light is our own product. We put it in the table on the same terms as everyone else, and where a rival is the better buy the page says so.

Left out: Maya Mobile. We could not read its own prices for this country on the day, so it stays out rather than being guessed.

Written and priced by the Ringo team. Prices change often; if you spot one that has moved, tell us through the contact page and we will update the table.