eSIM for London: practical guide for travelers [2026]

eSIM for London: practical guide for travelers [2026]

Editor: Marco Bianchi — UK-London community-attested guide. Procedures verified on official Airalo channels (Uki Mobile catalog, United Kingdom) and validated on fibraforum thread 42484 (post 40 charlisto "Used without the slightest problem in Canada , Dubai, UK and South Africa", post 6 ilboy95 landing-experience, post 43 alanfibra troubleshooting, post 48 rikyxxx pricing-honest) + Reddit r/AskUK, r/london, r/Airalo. Pricing and procedures snapshot as of May 7, 2026.

London is the clearest case for the value of an eSIM for international travelers in the post-Brexit era. Until December 31, 2020, the United Kingdom was inside the European " Roam Like at Home " framework: EU travelers used their home plan exactly as in their home country, no roaming, no surprises. Starting January 1, 2021, this rule broke. EU carriers removed the UK from European packages. For US, Canadian, Australian or Asian travelers, the UK has always been roaming territory — but the old EU traveler trick of "my plan just works" no longer applies. For everyone visiting London, the data math now is: $3–5/day with carrier roaming passes, or per-MB rates that can be brutal.

The alternative is exactly the one that emerged in the post-Brexit years: buy an Airalo eSIM for $4–15 covering your stay and forget about roaming costs from a mobile connectivity standpoint. It's the obvious move for any traveler who already uses Airalo for the USA , Turkey or Japan — but many travelers discover the problem only after they land at Heathrow, see "Premium Roaming" on their phone, and get a carrier alert that 1 GB costs €18.

Below you'll find Airalo United Kingdom plans (Uki Mobile line) with real catalog prices, the post-Brexit context, EE/Vodafone UK/O2/Three coverage across London (Westminster, City, Camden, Soho, Shoreditch), the critical Tube point (the Underground does NOT have cellular coverage on most lines), pre-flight setup, and the day-trips that change the equation: Oxford, Cambridge, Bath, Brighton, Stonehenge.

The Airalo eSIM for London in two lines

TL;DR — Airalo in London: The Airalo eSIM for the United Kingdom (Uki Mobile line) primarily rides on the EE network (owned by BT Group), the UK's top carrier for 4G/5G coverage. It also works on Vodafone UK and O2 in multi-network mode. You install the eSIM before your flight; upon landing at Heathrow, Gatwick, Stansted, Luton or London City, the line auto-connects within 1–2 minutes. From that point on you use Maps, Citymapper, Uber, Trainline and restaurant bookings without paying carrier roaming. Pricing for the London weekend plan: 1 GB / 7 days at $4.50; for 7–10 days: 5 GB / 30 days at $15.

The experience pattern is the one described by charlisto (fibraforum post 40): "Adding my experience. Used without the slightest problem in Canada, Dubai , UK and South Africa. Super convenient, and works great." charlisto is the most direct community reference on the Airalo UK network — the reported experience is one of a network that works "without the slightest problem" in the UK.

The post-Brexit context: why an eSIM really matters now

Before everything else, the Brexit point needs to be clarified because many travelers don't realize it until they're already in London.

What happened on January 1, 2021. With the end of the Brexit transition period, the United Kingdom formally left the European Union, including the single market for telecommunications. EU regulation 2015/2120 ("Roam Like at Home") requires EU carriers not to charge roaming extras for customers traveling within other EU states. Since January 1, 2021, the UK is no longer an EU state, so the regulation no longer applies to the UK.

What EU carriers did. Individual commercial decisions, not legal obligation. Most major EU carriers (Vodafone, Orange, Deutsche Telekom, TIM, WindTre and so on) removed the UK from standard European packages during 2021–2022, with some exceptions in business plans. A handful of low-cost carriers (Iliad is the notable example in France and Italy) kept the UK free on their main plans. Conditions change over time — verify YOUR specific plan in your carrier's app before leaving. For US, Canadian, Australian and other non-EU travelers, the UK has always been international roaming territory, so the carrier-pass vs eSIM math is even more lopsided.

How much UK roaming costs without a pass. On most EU carriers without a pass, per-use rates for non-EU roaming run €6–12 per MB (yes, MB, not GB). Opening Maps for 5 minutes can easily cost €5–10. That's why carriers sell non-EU packages: Vodafone Smart Passport ($3–6/day), AT&T International Day Pass ($10/day), Verizon TravelPass ($10/day for UK). These pass-style products are common across Vodafone Smart Passport and equivalent carriers.

How much the equivalent Airalo eSIM costs. For a 3–4 day weekend in London: 1 GB / 7 days at $4.50 ≈ €4.15 — the TOTAL for the weekend. For 7 days: 3 GB at $9 ≈ €8.30. For 10 days with average use: 5 GB at $15 ≈ €13.80. The break-even vs a $10/day carrier pass ($30 for 3 days, $70 for 7 days, $100 for 10 days) is obvious: the eSIM costs 1/4 to 1/7 the price of a carrier pass.

For the full picture of post-Brexit EU roaming and why other countries ( Switzerland ) have different rules: EU roaming: why the UK left Roam Like at Home .

What to know before you leave

Visa: visa-free for most travelers up to 6 months (tourism). Most Western nationalities (US, Canada, Australia, NZ, EU citizens, etc.) enter the United Kingdom visa-free for stays up to 6 months for tourism. As of 2025, the ETA (Electronic Travel Authorisation) system is in effect — a mandatory paid electronic authorization (£10), to be obtained at least 72 hours before departure on the official gov.uk site. It's valid for 2 years. A valid passport is required (national ID cards from EU countries are NOT accepted since 2021, post-Brexit). Check your nationality's specific requirements before you book.

Arrival airport: Heathrow (LHR), Gatwick (LGW), Stansted (STN), Luton (LTN), London City (LCY). Heathrow is the largest, hosting most long-haul flights from the US, Canada and Asia. Gatwick handles a mix of long-haul and European routes (easyJet, Vueling). Stansted — Ryanair. Luton — Ryanair, Wizz Air. London City — short-haul business flights from European cities. In all five airports the Airalo eSIM is already active upon landing.

From Heathrow to the center: Heathrow Express (Paddington in 15 min, ~£25), Piccadilly Line (60 min, £5.60 with Oyster), Elizabeth Line / Crossrail (35 min to center, £12). From Gatwick: Gatwick Express (London Victoria in 30 min, £22), Thameslink/Southern (London Bridge in 45 min, ~£12).

eSIM technical prerequisite. iPhone XS onward (2018) all compatible. On Android: Samsung Galaxy S20+, Pixel 3+, Xiaomi 12T+, OnePlus 9+ are good.

Home number for banking/2FA. Dual-SIM is the default pattern. Keep your home SIM active for bank SMS (foreign cards trigger 3D Secure daily in the UK because London is a sentinel anti-fraud market), authenticator codes, card OTPs and 2FA. Incoming calls on your home number are free to receivers from your country even when you're outside your home network.

Data roaming ON for the Airalo line (not your primary). Critical point. iPhone treats the Airalo line as "roaming" even though the eSIM connects locally to EE. Without the "Data Roaming" toggle ON for the Airalo line, the device won't connect. alanfibra (fibraforum post 43): "Did you enable data roaming?"

Contactless everywhere. Off-topic but useful: in London EVERYTHING is paid by contactless, including Tube, bus and regional rail (Tap-In/Tap-Out with the same card you use for coffee). Apple Pay and Google Pay work. Keep your home SIM active for SMS confirmation of payments above £50.

Airalo United Kingdom plans (London)

Airalo Uki Mobile (UK) catalog as of May 7, 2026, primary network EE. There are two variants: Uki Mobile (standard) and Uki Mobile Plus (higher price, some additional features depending on the plan).

Indicative table as of May 7, 2026 — verify at checkout on airalo.com.

Which size to pick for London specifically. London has free WiFi practically everywhere: every pub, every cafe, every hotel, every museum (most of them free), every Tube station (TfL WiFi). Actual cellular data consumption tends to be medium-low because you often connect to WiFi. But — London-specific point — the Tube is a dead zone, and since the Underground is the dominant way to get around, you end up using more cellular data than you'd expect between one station and the next (Citymapper always open).

For a 3-day weekend: 1 GB / 7 days at $4.50 is enough. For 7 days in London only: 3 GB / 30 days at $9. For 10-14 days London + Oxford/Cambridge/Bath day-trips: 5 GB / 30 days at $15. For travelers doing the classic UK tour London → Edinburgh → Lake District for 14+ days: 10 GB / 30 days at $22.50. For heavy users on a 7-day trip with lots of streaming: the Unlimited plan at $35 for 10 days can be worth it vs 5 GB + top-up.

For the full picture of the UK catalog with a London + Edinburgh + day-trips scenario: complete UK guide: plans, nationwide coverage, FAQ .

Coverage across London neighborhoods

EE is the UK's top carrier for 4G/5G coverage (RootMetrics 2025 confirms). Vodafone UK and O2 are the second and third carriers. Three is fourth. Airalo Uki Mobile primarily uses EE, with Vodafone/O2 fallback in some areas (multi-network).

Heathrow (LHR), Gatwick (LGW), Stansted (STN), Luton (LTN), London City (LCY) airports. Full 5G coverage in all five. "Installed at the airport, working immediately upon landing" is the expected pattern (ilboy95, fibraforum post 6, referring to Dubai but identical for the UK).

Westminster, City of London, South Bank. Historic, political and financial core. Full 5G coverage everywhere. Big Ben, Houses of Parliament, Westminster Abbey, Trafalgar Square, Buckingham Palace, St Paul's Cathedral, London Eye, Tate Modern — all covered.

Soho, Covent Garden, Mayfair, Marylebone. Theater, shopping and restaurant district. Full 5G. Carnaby Street, Oxford Street, Bond Street — all covered. Inside major department stores (Selfridges, Liberty, Harrods in Knightsbridge), the signal holds 4G where there isn't 5G.

Camden, Notting Hill, Shoreditch, Hoxton. Trendy / alternative neighborhoods. Full 5G. Camden Market, Portobello Road, Brick Lane, Spitalfields Market — all covered. Shoreditch in particular has redundant coverage for the tech district.

Greenwich, Canary Wharf, Docklands. East London, financial and maritime districts. Full 5G. Royal Observatory Greenwich, O2 Arena, Canary Wharf financial hub — all covered. The DLR (Docklands Light Railway, elevated) has full 4G/5G coverage.

Kensington, Chelsea, South Kensington (museums district). West London, residential and museum districts. Full 5G. Natural History Museum, Science Museum, V&A, Royal Albert Hall — all covered.

Tube — the critical point. The London Underground is a dead zone on most lines. Historically, Tube tunnels have no cellular coverage because they were dug in the late 1800s / early 1900s and never wired for radio. Since 2024, TfL has begun a 4G/5G rollout — the entire Elizabeth Line (Crossrail) is complete, parts of the Jubilee Line (Westminster-Canary Wharf), Central Line (Oxford Circus-Liverpool St), Northern Line (Camden Town-Stockwell). The other lines (Bakerloo, Circle, District, Hammersmith & City, Metropolitan, Piccadilly, Victoria, Waterloo & City) still have coverage ONLY at stations when the train is stopped, NOT in the tunnels. The situation is improving every year, though — check the TfL Go app for updates.

Tube backup: free TfL WiFi in EVERY station, one-time email registration. It works when the train is stopped at a station. Between stations, nothing. So if you take the Piccadilly Line from Heathrow to the center (60 minutes) or the Northern Line south, expect internet to come and go. For Citymapper or Maps, load the route before you go underground.

DLR (Docklands Light Railway) and Overground. Elevated or above-ground, full 4G/5G coverage.

Community voices on the UK network. charlisto (fibraforum post 40): "Used without the slightest problem in Canada, Dubai, UK and South Africa. Super convenient, and works great." It's the most direct community reference on the Airalo UK network. Gabbo (fibraforum post 12) asked more generally: "Do you pick the carrier to ride on yourself or can it connect automatically?" For the UK, leave it automatic — the Uki Mobile eSIM picks up EE on its own. NicoInve (post 2): "everything works great first try" — applies to the UK as much as to other non-EU countries.

Pre-flight setup + landing at Heathrow/Gatwick

The procedure is the same as for any Airalo eSIM. Full checklist below.

A week before departure

1. Airalo app (or airalo.com), search for "United Kingdom". You'll find the Uki Mobile plan.
2. Pick the size (1 GB weekend, 5 GB for 7-14 days).
3. Purchase: you get a QR + a pending eSIM ready to install.
4. Do NOT install the eSIM yet — wait until the night before departure.

The night before the flight (at home, on WiFi)

iPhone procedure (iOS 17/18/19):

1. Settings > Cellular.
2. "Add eSIM" > "Use QR Code".
3. Scan the Airalo QR from the email.
4. Label: "Airalo UK" or "Airalo London".
5. "Default Line": your home number.
6. "iMessage and FaceTime": your home number.
7. "Cellular Data": assign to Airalo.
8. "Allow Cellular Data Switching": off.

Android procedure (Samsung / Pixel / Xiaomi):

1. Settings > Connections > SIM Manager.
2. "Add eSIM" > "Add via QR".
3. Scan the Airalo QR.
4. Label the line, "Mobile data line" = Airalo.

In-flight

• Verify "Data Roaming" is ON for the Airalo line. "Did you enable data roaming?" (alanfibra, post 43).
• Download offline Maps for Greater London + Oxford + Cambridge + Bath if you're planning day-trips.
• Download the TfL Go (Tube/bus timings), Citymapper (multi-modal London), Trainline (national rail), Uber, Bolt, OpenTable apps.

Landing at Heathrow / Gatwick / Stansted / Luton / London City

• Airplane mode OFF, the eSIM grabs EE within 1-2 minutes.
• Banner reads "Airalo UK — Uki Mobile" or "EE".
• Quick test: WhatsApp, then open TfL Go to plan your route to the center.
• Heathrow → center via Elizabeth Line (Crossrail): full 5G coverage (the line is wired 4G/5G end-to-end).
• Gatwick → London Victoria via Gatwick Express: solid 4G except for brief drops on some stretches.

If the eSIM doesn't activate on arrival

Three things, in order:

1. Data Roaming ON for the Airalo line (not your home primary). Fix #1 in 80% of cases.
2. APN configured. Normally automatic for Uki Mobile.
3. Manual carrier selection. Settings > Cellular > Airalo line > Network Selection > "EE". If EE isn't available, try "Vodafone UK" or "O2 (UK)".

If none of the three fix it, contact Airalo support via in-app chat. Free WiFi _Heathrow Wi-Fi and Gatwick Wi-Fi are available.

For the full procedure: step-by-step Airalo eSIM setup guide .

Day-trips from London: coverage and recommendations

Oxford (1 hour by GWR from Paddington). Bodleian Library, Christ Church College (Harry Potter location), Radcliffe Camera, Magdalen College. Full 5G coverage in the historic center and colleges. On GWR London-Oxford trains, coverage holds 4G/5G at stations and in urban areas, with brief drops on rural stretches.

Cambridge (1 hour by LNER/Greater Anglia from King's Cross/Liverpool St). King's College Chapel, punting on the River Cam, Trinity College, Fitzwilliam Museum. Full 5G coverage in the center. While punting on the River Cam, the signal holds 4G.

Bath (1h30 by GWR from Paddington). Roman Baths, Royal Crescent, Bath Abbey, Pulteney Bridge. Full 5G coverage. Stonehenge (near Bath, accessible by tour) — 4G coverage at the visitor center and parking areas, may briefly drop on the trails around the circle.

Brighton (1 hour by Southern Railway from London Bridge/Victoria). Brighton Pier, North Laine, Royal Pavilion, the beach. Full 5G coverage across the city.

Windsor (45 minutes by GWR/SWR). Windsor Castle, Eton, Legoland Windsor. Full 5G coverage.

Stratford-upon-Avon (2 hours by Chiltern Railways). Shakespeare's birthplace, Royal Shakespeare Theatre. 5G coverage in the historic center, 4G in rural areas immediately outside.

Long day-trips: Edinburgh, Manchester, Liverpool. By national rail (LNER, Avanti West Coast) — 4-5 hours. The Airalo Uki Mobile eSIM covers all of the UK on the same EE network, no plan change needed. But on rural Scottish stretches (Highlands) the signal drops — that's normal, applies to any UK network.

Is Airalo or an alternative the right call for London?

Carrier roaming passes (AT&T International Day Pass / Verizon TravelPass / Vodafone Smart Passport). Post-Brexit, the UK is roaming territory on most carriers. Typical pricing: $10/day for daily-use passes (AT&T, Verizon) or €3–6/day for European carrier passes. For 7 days in London = $70 / €49. Compare with Airalo Uki Mobile 3 GB / 30 days = $9 ≈ €8.30 (the whole cost for 7 days). The carrier pass costs 5–8x more than the Airalo eSIM and gives you less data. For the detailed calculation: Airalo vs carrier roaming passes: the post-Brexit math .

Low-cost carriers — the exception. A handful of low-cost EU carriers (Iliad in France/Italy is the notable example) kept the UK free on their main plans. If your home carrier includes UK roaming at no extra cost (verify in your plan), the Airalo eSIM is redundant. For everyone else, post-Brexit London now has a real roaming cost.

UK prepaid SIM (GiffGaff, Lebara, Three Pay As You Go). Available online before departure with home delivery (GiffGaff) or in a London shop on day one (Three, EE, O2 in the Vodafone shops on Oxford Street). Costs £10–20 for 5–10 GB / 30 days. Pro: UK number for local calls, plenty of data, full local experience. Con: you physically swap the SIM (losing your home number for bank SMS / 2FA), registration required, 30–45 minutes of time. For 30+ day stays or students living in London, this can win. For a 7–14 day tourist trip, Airalo is simpler.

Holafly UK eSIM (unlimited). ~$25–30 for 7 days unlimited. Worth it if you expect very high consumption (streaming, work). For the full picture: Airalo vs Holafly for the United Kingdom . NicoInve (post 7) says: "Skip Holafly or other very 'touristy' services, Airalo actually works really well" — peer opinion.

rikyxxx (post 48) on the broader economics: "Airalo and the like aren't worth it for 30-day plans with lots of GB ... Worth it if you're staying 1 or 2 weeks max, picking the plan with few GB." Applies to London: for 30+ days with 20+ GB, a GiffGaff SIM may win. For the classic 3–10 day tourist trip, Airalo is the dominant choice. BestName (post 18) honestly notes: "I find it a bit pricey lately, though. Reliable." — Airalo UK is one of the cheaper plans in the Airalo catalog (compared to USA or regional), and reliability is confirmed by charlisto specifically for the UK.

Quick comparison for 7 days in London, average use 3 GB:

• Airalo Uki Mobile 3 GB / 30 days: $9 ≈ €8.30 (winner)
• AT&T International Day Pass 7 days ($10/day): $70 (8x more expensive)
• Verizon TravelPass 7 days ($10/day): $70
• GiffGaff goodybag 5 GB 30 days: ~£10 ≈ €11.60 (but you lose your home number)

London FAQ

Do I need to buy an eSIM for London after Brexit? Almost certainly yes. Most EU carriers (Vodafone, TIM, Orange) removed the UK from European packages post-Brexit; non-EU carriers (US, Canada, Australia) have always charged for UK roaming. The Airalo eSIM is 1/4 to 1/8 the cost of carrier passes.

Does Airalo work in London? Yes, Uki Mobile rides on EE (top UK carrier). Full 5G coverage across Greater London, with national and regional trains covered.

How much does the Airalo eSIM for London cost? 1 GB / 7 days at $4.50 (weekend); 5 GB / 30 days at $15 (7-14 day sweet-spot); Unlimited / 10 days at $35 (heavy user short trip).

Does the eSIM work in the Tube? Mostly NO. Only the Elizabeth Line (wired 4G/5G) and specific stretches of Jubilee/Central/Northern. The other lines have coverage only at stations, NOT in tunnels. Backup: free TfL WiFi in every station.

What if the eSIM doesn't activate at Heathrow/Gatwick? Three checks: Data Roaming ON for the Airalo line, APN configured, manual carrier selection (EE, with Vodafone UK / O2 as fallback).

Did major carriers keep London on free roaming? For most consumer plans, NO. A handful of low-cost EU carriers (Iliad) are the exception. Verify YOUR specific plan in your carrier's app.

Can I use the same eSIM for Edinburgh or Bath? Yes, Airalo Uki Mobile covers all of the UK (England, Wales, Scotland, Northern Ireland) on the same EE network.

Can I keep my home number active in London? Yes, standard dual-SIM. Critical for bank SMS (daily 3D Secure in the UK), authenticator apps, 2FA.

Guide based on Airalo United Kingdom catalog (Uki Mobile line) as of May 7, 2026, validated on official airalo.com channels. Procedures verified on fibraforum thread 42484 (post 40 charlisto "without the slightest problem in the UK", post 6 ilboy95 landing-experience, post 43 alanfibra data-roaming troubleshooting, post 48 rikyxxx pricing-honest, post 18 BestName reliability) and on Reddit r/AskUK, r/london, r/Airalo. Community-attested testing. Post-Brexit context verified on official communications from major EU carriers (Vodafone, TIM, Orange, Iliad) and on gov.uk for ETA. This site contains affiliate links: if you purchase through these links we receive a commission at no additional cost to you.

Do I need to buy an eSIM for London after Brexit?

Almost certainly yes. After Brexit (January 1, 2021) the United Kingdom left the EU 'Roam Like at Home', the regulation that let EU travelers use their home carrier rate while roaming within the EU at no extra cost. Most major EU carriers (Vodafone, TIM, Orange, Deutsche Telekom) removed the UK from European packages (with exceptions on some business plans or specific options); some low-cost EU carriers like Iliad have kept the UK free for now. For US, Canadian and Australian travelers, the UK has always been international roaming territory. For most international travelers, going to London now means paying non-EU roaming (~€3–5/day with EU passes, $10/day with US carrier passes) or buying an Airalo eSIM for $4–15 for 7–30 days — the eSIM is by far cheaper.

Does Airalo work in London?

Yes. The Airalo eSIM for the United Kingdom (Uki Mobile line) primarily rides on the EE network (BT Group), the UK's top carrier for 4G/5G coverage. It also works on Vodafone UK and O2 in multi-network mode. Full 5G coverage across the entire Greater London area: Westminster, City of London, Camden, Notting Hill, Shoreditch, Soho, Covent Garden, Kensington, Greenwich. Works on national rail (LNER, GWR, Avanti) and on Southern, Thameslink and Elizabeth Line regional trains. Does NOT work on most Tube lines (see below).

How much does the Airalo eSIM for London cost?

Airalo Uki Mobile (UK) catalog as of May 7, 2026, two variants — Uki Mobile (standard) and Uki Mobile Plus: 1 GB / 7 days at $4.50 (standard) or $5.50 (Plus); 2 GB / 15 days at $7–8.50; 3 GB / 30 days at $9–11; 5 GB / 30 days at $15–16; 10 GB / 30 days at $22.50–27.50; 20 GB / 30 days at $36; Unlimited / 10 days at $35. For a 3–4 day London weekend: the 1 GB / 7 days plan at $4.50 is enough. For 7–10 days: 5 GB at $15.

Does the eSIM work on the London Tube?

Mostly NO, but it's improving. Historically the London Underground (Tube) was a dead zone for cellular signal. Since 2024, TfL has installed 5G/4G on the Elizabeth Line (Crossrail) and on specific stretches of the Jubilee, Central and Northern lines. Most of the historic lines (Bakerloo, Circle, District, Hammersmith & City, Metropolitan, Piccadilly, Victoria, Waterloo & City) still have coverage only at stations, NOT in the tunnels. Backup: free TfL WiFi is available at every station (email registration, free). The DLR (Docklands Light Railway) and Overground are covered normally because they're above-ground.

What if the eSIM doesn't activate at Heathrow or Gatwick?

Three checks, in order. One: Data Roaming ON for the Airalo line (not your home primary). alanfibra (fibraforum post 43): 'Did you enable data roaming?'. Two: APN configured (normally automatic for Uki Mobile). Three: manual carrier selection, pick EE in Settings > Cellular > Airalo line > Network Selection. Free WiFi is available at Heathrow (_Heathrow Wi-Fi), Gatwick (Gatwick Wi-Fi), Stansted, Luton, and City Airport so you can run the checks without using data.

Did major EU carriers keep London on free roaming?

For most plans, NO. After Brexit (January 1, 2021) the UK left EU Roam Like at Home. Vodafone Italia removed the UK from standard European packages. TIM did the same (except for some business options). WindTre followed the same pattern. Iliad has kept the UK free on its main plans (verify on your specific plan at the moment). In all cases, it's worth checking your carrier's app before leaving — the general rule is that the UK is now non-EU for most consumer plans. For US/Canadian/Australian travelers the UK has always been international roaming, so a carrier pass or eSIM is required.

Can I use the same Airalo eSIM for Edinburgh, Bath or Oxford?

Yes. The Airalo Uki Mobile eSIM covers all of the United Kingdom (England, Wales, Scotland, Northern Ireland) on the same EE network. Works in Oxford, Cambridge, Bath, Brighton, Bristol, Manchester, Liverpool, Edinburgh, Glasgow, Cardiff, Belfast. On national rail — LNER (London-Edinburgh), GWR (London-Bath), Avanti West Coast (London-Manchester) — coverage holds 4G/5G at stations and in urban areas, with drops on rural Scottish and Welsh stretches.

Can I keep my home number active in London?

Yes, standard dual-SIM scenario. Keep your home SIM active to receive bank SMS, authenticator codes, credit card OTPs (increasingly important in the UK where foreign cards trigger 3D Secure daily), 2FA codes. The Airalo Uki Mobile eSIM is added as a second line, you set it as your data line, and all traffic goes through Airalo. Your home number stays yours for incoming calls (free to receivers from your home country).