eSIM for London — Stay Connected in United Kingdom
Get a United Kingdom eSIM before you fly to London. Compare Airalo and Yesim — instant activation, no SIM swap, no roaming fees.
Connectivity in London
Local operators
EE, O2, and Vodafone are the strongest networks in London. EE has the most consistent 5G rollout across inner London.
Coverage
Coverage is strong everywhere above ground. Underground signal has improved on the Elizabeth line and parts of the Jubilee and Central lines — though older sections can drop. Overground and Elizabeth line have good indoor coverage.
How much data?
5–10 GB for a week in London. Maps navigation, streaming music, and catching up on messages while commuting on the Tube adds up. Hotels and most cafés have free Wi-Fi.
Using your phone in London
For non-UK visitors, roaming charges in London add up quickly — a week of Tube navigation, restaurant bookings, and streaming is enough to make an eSIM worth it. EE has the strongest 5G rollout across Zone 1–3, with particularly good coverage on the Elizabeth line and Overground.
How an eSIM works
Buy online
Choose your plan and purchase. No physical SIM is shipped.
Scan QR code
Open your phone settings and scan the QR code from your email.
Arrive and connect
Your eSIM activates automatically when you land and detects the local network.
Use your data
Your home SIM stays active for calls. Use eSIM data without roaming charges.
Compare providers
Both work in United Kingdom. Here's how they compare for your London trip.
Airalo
Largest networkWorld's largest eSIM marketplace
200+ countries including all EU destinations
- check_circleCountry-specific plans that connect to top local networks
- check_circleWorks in 200+ countries — ideal for multi-country Europe trips
- check_circleData-only plans from around €4 for 1 GB
- check_circleQR code delivered instantly after purchase
- check_circleWell-rated iOS and Android app
Best for
Single-country trips or precise country-by-country coverage
Yesim
Best for EuropeSeamless European connectivity
150+ countries with Europe-wide regional plans
- check_circleEuropean regional plans covering 30+ countries in one activation
- check_circleCompetitive data rates with unlimited options in many markets
- check_circleeSIM + Wi-Fi calling in some markets
- check_circleVirtual phone number available as an add-on
- check_circleSmooth app with real-time data usage tracking
Best for
Multi-country European itineraries or travellers who want one plan across borders
Does your phone support eSIM?
Most phones released after 2019 support eSIM — including iPhone XS and later, Samsung Galaxy S20 and later, and Google Pixel 3a and later. To check: on iPhone, go to Settings → General → About → Available SIM. On Android, Settings → Network → SIM card → Add eSIM.
Carrier-locked phones (bought on a contract) may not support eSIM until the lock is removed. Contact your carrier if you're unsure.
eSIM questions
What is an eSIM and do I need one for travel?expand_more
An eSIM is a digital SIM card built into your phone — you activate it by scanning a QR code, with no physical card swap needed. For European city breaks, it's the easiest way to get a local data plan: buy it before you leave, scan the QR code, and switch to it when you land. You avoid roaming charges without visiting a local phone shop or swapping SIMs at the airport.
Which phones support eSIM?expand_more
Most recent smartphones support eSIM: iPhone XS and later, Samsung Galaxy S20 and later (most models), Google Pixel 3a and later, and many other Android flagships. To check, go to Settings → General → About on iPhone, or Settings → SIM card → Add SIM on Android. Not all carrier-locked phones support eSIM — if your phone was bought on a contract in the UK or US, it may be locked.
Is Airalo or Yesim better for European travel?expand_more
Both work well across Europe. Airalo has the largest country coverage (200+ countries) and country-specific data plans that connect to local networks. Yesim offers competitive rates on regional European plans with longer data validity and a slightly more polished app experience. For a trip to a single country, compare both — Airalo often wins on country-specific plans, while Yesim's European bundles are competitive for multi-country trips.
Can I keep my existing number active while using an eSIM?expand_more
Yes. Your physical SIM stays active in your phone alongside the eSIM. You can receive calls and SMS on your home number while using the eSIM's data plan. Most phones show both SIMs in settings and let you choose which to use for calls, messages, and data. Your home carrier's rates still apply for calls/texts — only data routes through the eSIM.
When should I buy an eSIM for my trip?expand_more
Buy it any time before you land. Most eSIMs activate immediately when you scan the QR code, so buy it a day or two before departure, install it, and switch to it at the airport. Avoid buying at the airport in your destination — prices at local kiosks are significantly higher. Both Airalo and Yesim deliver instant QR codes after purchase.
Will an eSIM work at the airport on arrival?expand_more
Yes — as long as you install and activate it before you land. If you're on a European city break, activate your eSIM in transit or just before landing. The local network picks it up automatically when you arrive. If you haven't installed it yet, you'll need Wi-Fi (in the arrivals hall) to scan the QR code from your email.
Ready for London?
Get your United Kingdom eSIM now — takes 5 minutes, works the moment you land.