eSIM London — Data Plans from $3.49

HelloRoam is a global eSIM provider offering instant mobile data in 185+ countries. Buy prepaid travel eSIM plans with no extra fees, no contracts, and instant activation on any eSIM-compatible device.

London eSIM with instant activation - international travel data plans - no extra fees - 5G mobile network

London eSIM card data plans for international travel

Package details

The cheapest eSIM for London starts from $3.49. Local 4G LTE and 5G data on top carrier networks in London. Works on all eSIM compatible phones.

Start your London trip connected from the moment you land. HelloRoam prepaid e-sim card activates via QR code in under 2 minutes on any eSIM compatible phone. Plans start from $3.49, well below Verizon TravelPass ($10/day), T-Mobile international add-ons, and AT&T International Day Pass. Skip the airport SIM shop and skip the carrier contract. HelloRoam connects to the strongest local 4G LTE or 5G network automatically, whether you're in a city or a rural area. One account covers 185+ countries through 148+ carrier networks.

HelloRoam: the best eSIM for London. Plans from $3.49, set up before your flight, no store visit, no SIM swap. Keep your number active on dual SIM. Works on any e-sim compatible iPhone or Android.

Unlimited Data

5GT-Mobile UK

Choose number of eSIMs

1 eSIM

How long will you be away?

Choose durationHow many days?

7 Days

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Save 8%

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eSIMs/Travelers

Up to 5G support

5GT-Mobile UK

Choose number of eSIMs

1 eSIM

Choose number of eSIMsHow many travellers

1 eSIM

TotalFrom $3.49USD

Activate instantly

Install your eSIM before or during your trip. Your plan starts when your device connects to a local network at your destination, and auto-activates after 120 days. User guide

Apple App Store

Rated 5/5

Secure payment guaranteed

eSIM - 1

$0.00

eSIM - 1

$0.00

An eSIM for London from HelloRoam starts at $3.49 per day across 148+ carrier networks in 185+ countries. Activate via QR code in under two minutes on any eSIM compatible phone. Keep your AT&T, T-Mobile, or Verizon number active.

148+ networks
5G
under 2 minutes activation

UpdatedApril 2026

London eSIM with fast 5G coverage

London is the UK's capital and one of the world's most visited cities, attracting over 20 million international visitors per year. From the Tower of London, Buckingham Palace, and the British Museum to the markets of Borough and Portobello, and the neighborhoods of Shoreditch, Notting Hill, and Greenwich, London is a city that requires reliable navigation at every turn. local partner networks, the two strongest networks in the capital. Buy your plan before you fly, scan the QR code, and land at Heathrow, Gatwick, or Stansted with data already working. Coverage is near-total outdoors across Inner London, and the Elizabeth line and Overground have good surface coverage. Plans start at $3.49.

Plans start at $3.49 with 5G speeds
Coverage from T-Mobile UK and 3+ other operators
Instant activation in under 5 minutes
180-day money-back guarantee
London coverage across major cities

How to use HelloRoam

How to Set Up an eSIM in London

Follow these steps to set up your eSIM card on iPhone or Android. Works for any eSIM for international travel, no replacement sim, no store visit.

Set up an eSIM on your iPhone with the HelloRoam app

iPhone settings screen showing cellular options

10GB

Most travelers choose 🔥

Starting from

Choose your plan & checkout online

Select a data plan for your destination and complete checkout.

Scan the QR code

Scan the QR code to install your eSIM instantly.

Installing...

Activate in minutes: ready on arrival

Your eSIM installs instantly and activates when you land.

Manage it all from our mobile app

Track usage, top up data, and manage all your eSIMs in one place.

10GB

Most travelers choose 🔥

Starting from

Choose your plan & checkout online

Select a data plan for your destination and complete checkout.

Scan the QR code

Scan the QR code to install your eSIM instantly.

Installing...

Activate in minutes: ready on arrival

Your eSIM installs instantly and activates when you land.

Manage it all from our mobile app

Track usage, top up data, and manage all your eSIMs in one place.

10GB

Most travelers choose 🔥

Starting from

Choose your plan & checkout online

Select a data plan for your destination and complete checkout.

Scan the QR code

Scan the QR code to install your eSIM instantly.

Installing...

Activate in minutes: ready on arrival

Your eSIM installs instantly and activates when you land.

Manage it all from our mobile app

Track usage, top up data, and manage all your eSIMs in one place.

10GB

Most travelers choose 🔥

Starting from

Choose your plan & checkout online

Select a data plan for your destination and complete checkout.

Scan the QR code

Scan the QR code to install your eSIM instantly.

Installing...

Activate in minutes: ready on arrival

Your eSIM installs instantly and activates when you land.

Manage it all from our mobile app

Track usage, top up data, and manage all your eSIMs in one place.

Trip changed? Don't worry, we've got you!

Plans can change anytime, and that's okay. With HelloRoam, you can easily request a refund for your eSIM within 180 days of purchase.

Learn more about our refund policy

London eSIM vs AT&T, T-Mobile, and Verizon Roaming

When comparing eSIM vs a travel SIM card for London, HelloRoam wins on price. It beats Verizon TravelPass ($10/day), T-Mobile international add-ons, and AT&T International Day Pass fees. Skip the airport SIM shop and get a better international data plan from $3.49 with a 180-day refund guarantee.

Feature		Local provider	Limited data eSIM
180-day refund policy
24/7 live chat support
$0 activation fees
99.8% uptime guarantee
No data overage charges
Instant QR code delivery
Premium London carrier networks

Why Travelers Choose HelloRoam e-sim for London

24/7 live chat support

Need help at 2 AM in Tokyo or midnight in Paris? HelloRoam support is available 24/7. Message us and a real person responds in under 5 minutes. No bots, no wait queue.

Activate your e-sim in under 2 minutes

Buy your plan, scan the QR code, and you're connected the moment you land. No store visit, no SIM swap, no paperwork. Works on any eSIM compatible phone in under 2 minutes.

Keep your AT&T, T-Mobile, or Verizon number

Keep your AT&T, T-Mobile, or Verizon number active for calls and texts. HelloRoam runs as a second eSIM line on any dual SIM compatible phone, so you never miss a call from home.

148+ local carrier networks

HelloRoam eSIMs connect to 148+ carrier networks across 185+ countries. Your phone switches to the strongest available 4G LTE or 5G signal automatically.

Data alerts before you run out

HelloRoam alerts you at 80% data usage so you never hit a surprise cap mid-trip. Top up instantly from the app without reinstalling your eSIM or visiting a store.

Local 4G LTE and 5G speeds

Your London e-sim card connects to trusted local 4G LTE and 5G networks. HelloRoam picks the strongest available signal for navigation, streaming, and video calls.

Regional and global eSIM plans

Heading to multiple countries? HelloRoam regional eSIM plans cover Europe, Asia, the Americas, and 185+ destinations in one purchase. Tourist eSIM or long-stay: choose fixed data or unlimited data plans. One account, no SIM swaps.

Free hotspot and data sharing

Share your London eSIM data with a laptop or tablet using your phone's built-in hotspot. No extra fees, no setup required. Works on all eSIM compatible phones.

24/7 live chat support

Need help at 2 AM in Tokyo or midnight in Paris? HelloRoam support is available 24/7. Message us and a real person responds in under 5 minutes. No bots, no wait queue.

Activate your e-sim in under 2 minutes

Buy your plan, scan the QR code, and you're connected the moment you land. No store visit, no SIM swap, no paperwork. Works on any eSIM compatible phone in under 2 minutes.

Keep your AT&T, T-Mobile, or Verizon number

Keep your AT&T, T-Mobile, or Verizon number active for calls and texts. HelloRoam runs as a second eSIM line on any dual SIM compatible phone, so you never miss a call from home.

148+ local carrier networks

HelloRoam eSIMs connect to 148+ carrier networks across 185+ countries. Your phone switches to the strongest available 4G LTE or 5G signal automatically.

Data alerts before you run out

HelloRoam alerts you at 80% data usage so you never hit a surprise cap mid-trip. Top up instantly from the app without reinstalling your eSIM or visiting a store.

Local 4G LTE and 5G speeds

Your London e-sim card connects to trusted local 4G LTE and 5G networks. HelloRoam picks the strongest available signal for navigation, streaming, and video calls.

Regional and global eSIM plans

Free hotspot and data sharing

Share your London eSIM data with a laptop or tablet using your phone's built-in hotspot. No extra fees, no setup required. Works on all eSIM compatible phones.

What Is an e SIM? How eSIM Works in London

An eSIM card is a digital SIM built directly into your phone. There is no plastic chip and no SIM tray to deal with. Scan a QR code to activate your e SIM in under 2 minutes on any eSIM compatible iPhone or Android. It works as a prepaid data plan for London travel with no airport SIM shop, no replacement SIM card, and no carrier contract. Follow the step-by-step setup guide to get connected before your flight. guide

Unlimited Data

Up to 5G support

Data sharing

Learn more about eSIM

15.56 GB

Out of 30 GB left

10GB

London eSIM Coverage Guide

London has strong 5G and 4G LTE coverage across all central and inner boroughs including Westminster, the City, Southwark, Camden, Islington, Hackney, and Canary Wharf. Heathrow (LHR), Gatwick (LGW), Stansted (STN), and Luton (LTN) airports all have full coverage. The London Underground has 4G coverage at most surface and sub-surface stations on the DLR, Overground, and the newly upgraded Central, Jubilee, Northern, Piccadilly, and Elizabeth lines. Deep tube lines still have gaps in tunnel sections. The Elizabeth Line from Heathrow to Paddington is covered throughout. local partner networks at your London airport on landing.

Get your eSIM

HelloRoam connects to T-Mobile UK 5G, Three 4G, O2 5G and 1 more in London
5G and 4G LTE across all central London boroughs and the Elizabeth Line
All four London airports fully covered in their terminal zones
Plans from $3.49 with instant activation before your flight

SourcesOfcom UK Connected Nations Report (2026); Transport for London connectivity (2025)

eSIM Travel Tips for London

Your eSIM Connects at All Four London Airports
Whether you land at Heathrow, Gatwick, Stansted, or Luton, local partner networks in the UK immediately. The Elizabeth Line from Heathrow to central London has full coverage. The Gatwick Express and the Stansted Express are both covered throughout. No need to hunt for a SIM card counter on arrival.
Download the Tube Map for Deep Line Gaps
Most of the London Underground now has 4G, but the Victoria, Bakerloo, and parts of the District and Circle lines in deep tunnels still have gaps. Download TfL Go or Citymapper in offline mode before your first tube journey. The maps work without data, so you always know your stop even without signal.
Stay Connected in the UK from $3.49
A HelloRoam eSIM for the UK covers London from Heathrow to the Tower of London, day trips to Windsor Castle and Oxford, and the full train network. Plans start from $3.49. Activate before your flight and arrive with data ready.

Get your eSIM

Best Time to Visit London

London is visited year-round. June, July, and September offer the most reliably warm weather, between 18C and 25C, with long evenings and outdoor markets at their most active. Wimbledon (late June to early July) and the Notting Hill Carnival (August bank holiday) are major summer events. August is the hottest month but also when many London families go on holiday, so the city is less locally populated even as tourist numbers peak. April and May are pleasant with spring flowers in Hyde Park and the Chelsea Flower Show in May. October and November offer autumn colors in Richmond Park and Hampstead Heath, cooler temperatures (10C to 16C), and London's world-class indoor culture. December brings the Christmas markets at Southbank and Winter Wonderland in Hyde Park. January and February are the cheapest months for flights and hotels and the best time to visit major museums without queues. London weather in any month can include rain: always carry a layer.

Top Attractions in London

Big Ben

Big Ben's clock tower at the Palace of Westminster is one of London's top landmarks. Use HelloRoam eSIM to stay connected.

Stand on Westminster Bridge for the classic Big Ben photo angle.

Buckingham Palace

Buckingham Palace is the official London residence of the British monarch since 1837. Use HelloRoam eSIM to stay connected.

Arrive by 11 AM for a good spot to watch the Changing of the Guard.

London Eye

The London Eye is a 135-meter observation wheel on the Thames South Bank. Use HelloRoam eSIM to stay connected.

Book a sunset pod for the best views as city lights start to glow.

Check Device Compatibility Data Usage Calculator

What Our Customers Say Join thousands of happy travelers

Apple App Store

Rated 5/5

4.8Rating

"Used HelloRoam on my trip to Tokyo. Had data the moment I landed at Narita. Way better than the AT&T international plan I was paying for."

Sarah M.

4.8Rating

"Saved a fortune vs Verizon TravelPass in Europe. Connected in Paris, Rome, and Barcelona without a single roaming charge."

James K.

"Set up my eSIM at LAX before boarding. By the time I landed in London, I had 5G data ready. No SIM swap needed."

4.8Rating

"HelloRoam covered 5 countries on my Southeast Asia trip. Cheaper than one day of T-Mobile international roaming."

David L.

4.8Rating

"The QR code setup took 2 minutes. Used it for work calls and navigation in Mexico City. Crystal clear connection."

Maria C.

4.8Rating

"180-day refund policy sold me. Ended up using every megabyte in Thailand. Will buy again for my next trip."

Michael T.

4.8Rating

"Used HelloRoam on my trip to Tokyo. Had data the moment I landed at Narita. Way better than the AT&T international plan I was paying for."

Sarah M.

"Set up my eSIM at LAX before boarding. By the time I landed in London, I had 5G data ready. No SIM swap needed."

4.8Rating

"HelloRoam covered 5 countries on my Southeast Asia trip. Cheaper than one day of T-Mobile international roaming."

David L.

4.8Rating

"The QR code setup took 2 minutes. Used it for work calls and navigation in Mexico City. Crystal clear connection."

Maria C.

4.8Rating

"180-day refund policy sold me. Ended up using every megabyte in Thailand. Will buy again for my next trip."

Michael T.

Prices verified: March 26, 2026

London eSIM Questions Answered

HelloRoam is the top-rated e SIM for Americans flying to London. It connects to 148+ carrier networks across 185+ countries, with plans from $3.49 in USD. You activate via QR code in under 2 minutes before leaving JFK, LAX, or any US airport. Your AT&T, T-Mobile, or Verizon number stays active through dual SIM while HelloRoam handles data abroad. You get local 4G LTE and 5G speeds, a 180-day refund guarantee, and 24/7 live chat support.

A London eSIM card from HelloRoam costs from $3.49 in USD. Fixed data plans range from 1GB to 20GB. Unlimited daily plans start at $20 for longer stays. Compare that to AT&T International Day Pass at $12/day, Verizon TravelPass at $10/day, or T-Mobile Go5G Plus add-ons. All HelloRoam e-sim plans include local 4G LTE and 5G access with no overage charges, no carrier contract, and no daily fees.

HelloRoam eSIM in London connects to local 4G LTE and 5G carrier networks, the same towers locals use. Your phone picks the strongest signal the moment you land at the airport. Coverage spans major cities, highways, and most rural areas. HelloRoam partners with 148+ carrier networks globally, so you get speeds similar to what you're used to on T-Mobile, AT&T, or Verizon at home.

Buy your London e SIM before you leave home in three steps. First, pick your plan at helloroam.com and check out in USD. Second, scan the QR code from your email in Settings under Add eSIM or Add Cellular Plan. Third, your eSIM installs in under 2 minutes. Set it up the night before your flight from LAX, JFK, SFO, or any US airport and land connected.

iPhone XS and all newer models work with HelloRoam e-sim in London. iPhone 14 and later sold in the US ship eSIM-only with no physical SIM tray. iPhone 15 and iPhone 16 support dual eSIM, so your AT&T or Verizon line stays active for calls while HelloRoam handles travel data. Go to Settings, tap Cellular, then Add eSIM, and scan the QR code from your email.

A London eSIM from HelloRoam starts from $3.49 per day, paid once in USD. AT&T International Day Pass charges $12 per day. Verizon TravelPass costs $10 per day. T-Mobile Go5G Plus includes some free data but throttles speeds after 5GB. HelloRoam connects to local networks in London at local data prices, not the retail roaming rates US carriers charge.

Activate your London eSIM at home before heading to the airport. Open Settings on your iPhone or Android, tap Add eSIM, and scan the QR code from your HelloRoam email. The process takes under 2 minutes. Your e SIM connects to a local network the moment your plane lands. No hunting for a SIM kiosk at JFK, LAX, or SFO. No SIM card swap needed.

HelloRoam offers a 180-day refund window on all eSIM plans, processed back to your original USD payment method. If your trip changes and you have not installed or activated your e-sim, you get a full refund. If you used some data, HelloRoam refunds the unused portion. Contact support with your order ID within 180 days. Refunds process in 5 to 14 business days to your US bank or card. HelloRoam's 180-day window is longer than Airalo and most competitors.

HelloRoam eSIM works on any carrier-unlocked phone, including phones originally on T-Mobile or Verizon. If your phone is paid off and unlocked, scan the QR code in Settings to add HelloRoam as a second line. Your T-Mobile or Verizon number stays active for calls and texts while HelloRoam handles data in London. Phones still on a carrier payment plan may require unlocking first. Complies with US CCPA data privacy rules. Does not sell personal data.

HelloRoam eSIM for business travel and leisure to London connects to 148+ carrier networks across 185+ countries, starting from $3.49, with a 180-day refund guarantee. Whether you need an eSIM for business travel or a vacation, it works on any unlocked eSIM compatible iPhone, Samsung, or Android phone. You get local 4G LTE and 5G speeds, 24/7 live chat support, and instant QR code delivery. No store visit and no contract required.

HelloRoam eSIM plans start from $3.49 per day across 185+ countries with no carrier contract. Compared to Verizon TravelPass at $10/day and T-Mobile international add-ons, HelloRoam gives you the same local data speeds at a fraction of the price. No store visit, no paperwork, and no locked contracts. Your eSIM arrives by QR code and activates in under two minutes.

HelloRoam is a global eSIM platform that partners with local carriers in 185+ countries, including London. Instead of charging retail roaming rates, HelloRoam connects your phone to a local partner network so you pay local data prices. You get the same speeds as a local prepaid sim card without the premium fees charged by T-Mobile or Verizon for international plans. Buy a plan, scan a QR code, and connect on arrival. Plans cover the EU, Europe, and 185+ destinations worldwide. HelloRoam is an eSIM platform, not an MVNO. It partners directly with local carrier networks in London to deliver data at local speeds.