eSIM for UK Visitors: London, the Tube and Getting Online

An eSIM for UK visitors gives you mobile data on a British network from the moment you land at Heathrow, Gatwick or Edinburgh, without a roaming bill or a queue at a phone shop. You install it at home, keep your usual SIM in the phone for calls and texts, and switch your data line over on arrival. It also solves a newer problem: since Brexit, free EU roaming no longer applies in the UK by default.

In short:

• One UK eSIM covers England, Scotland, Wales and Northern Ireland on British networks.
• EU and EEA visitors can’t count on roam-like-at-home in the UK any more. Check your provider or use a local data plan.
• About 1 GB a day is typical, so 5–10 GB suits most weeks. Heavy users can pick an Unlimited day pass.
• Mobile signal on the Tube is growing but not complete, so save tickets and maps before you go underground.

Why visitors use an eSIM in the UK

A trip to Britain runs on your phone more than you might expect. You tap in and out of the Tube, check train times, book rail tickets, find the right bus stop, pay for parking with an app and message friends about where to meet. Many museums, restaurants and attractions sell timed tickets online, and some pubs take orders through a QR code at the table.

Roaming from outside the UK can make all of that expensive. Buying a British SIM card on arrival means finding a shop, choosing a bundle and swapping SIMs, which then puts your own number out of reach for bank codes and calls from home.

Roamy’s United Kingdom plans start from $4.00 and run on local networks: EE, listed with 5G, and 3, listed with 4G, as shown on the United Kingdom eSIM page. The plans are data-only, so you don’t get a British number, but your usual SIM stays active for calls and texts.

Your phone needs to be unlocked and support eSIM. The eSIM-compatible phones page lists the models.

EU roaming in the UK after Brexit

Until 2021, a phone plan from any EU country worked in the UK as it did at home. That is no longer guaranteed. The EU’s Your Europe page on roaming lists the countries covered by roam-like-at-home, and the UK isn’t one of them. The page adds that many operators choose to extend these offers to other countries anyway.

So what you pay depends on your provider. Some EU plans still include the UK at no extra cost, some include it for a limited time or a smaller allowance, and some charge daily or per megabyte. If you are visiting from Türkiye, the US, the Middle East or Asia, roaming in Britain has never been included by default, and daily roaming passes add up quickly on a longer trip.

A local data plan on an eSIM avoids the question. You know the size and the price before you leave, and it doesn’t depend on fine print from your home provider.

Coverage in London and around Britain

The UK has good coverage in cities and along main roads and rail lines. It gets patchier in hills, valleys and very rural areas, which matters if your trip goes beyond London.

London and the Tube

Above ground, London has strong 4G and growing 5G coverage. Underground is a different story. TfL’s page on mobile and Wi-Fi underground says around 70 per cent of below-ground stations now have a mobile signal, the whole Elizabeth line is covered, and sections of lines such as the Central, Jubilee, Northern and Victoria have coverage in the tunnels too. Other stretches still have none.

TfL lists EE among the networks providing the service, along with Three, Vodafone and VMO2. Stations also have Wi-Fi, but the networks TfL names are run by UK mobile operators, so don’t count on it as a visitor. Before a long Tube journey, keep your ticket, your route and the address of where you are going saved on the phone.

Scotland, Wales and the countryside

Edinburgh, Glasgow, Cardiff, Manchester, Liverpool and other cities are well covered. On a road trip through the Scottish Highlands, Snowdonia or the Lake District, expect stretches with weak signal or none on any network. Download offline maps for the area before you set off, and don’t rely on mobile data for directions on single-track roads.

Near the Irish border

In Northern Ireland, close to the border, phones can sometimes pick up a signal from the Republic of Ireland. A UK-only plan doesn’t work on Irish networks. If you lose data near the border, choose a UK network manually in your phone settings. If your trip includes Dublin as well, look at a Europe eSIM and check that both countries are on its list.

How much data do you need in the UK?

Most of your data goes on maps, travel apps, messaging and photos. Hotel and café Wi-Fi helps, but it doesn’t follow you onto a train or around a market. As a rough guide:

That puts a typical week at 5–10 GB and two weeks at about 10–20 GB. For a breakdown by app, see our guide on how much data you need for travel.

Fixed data or an Unlimited day pass?

Fixed-data plans for the UK range from 1 GB to 50 GB. Most last 30 days, and there is a longer 50 GB option for extended stays. Most can be topped up on the same eSIM in the Roamy app, so you can start with a modest plan and add data if you need more.

An Unlimited day pass covers 1 to 90 days. Each day you get 3 GB at full speed, then reduced speed until the next day starts. It costs around $3.75 a day and suits heavy users, business travellers and anyone sharing a hotspot. Unlimited plans can’t be topped up, so choose enough days at the start.

The UK plus Europe on one trip

Plenty of trips combine London with Paris, Amsterdam, Dublin or a city break elsewhere. A United Kingdom plan works only in the UK, so it stops when you cross the Channel.

If your route covers more than one country, a Europe plan is often simpler. Regional plans cover a set list of countries, and the list can change with the plan size, so check that the UK and every other country on your route is included before you buy. Our guide to an eSIM for Europe across multiple countries explains how to compare options.

Entry rules worth checking

This isn’t about your eSIM, but it catches visitors out. The UK now requires most visitors who don’t need a visa to have an Electronic Travel Authorisation (ETA) before they travel, including visitors from Europe, the USA, Canada and Australia. Every traveller needs one, including children. GOV.UK warns about websites that imitate government services, so apply only through GOV.UK.

Turkish citizens are on the UK’s visa national list, so they need a visitor visa rather than an ETA. Rules change, so check your own nationality on GOV.UK before you book.

Setting up before you fly

A few minutes at home saves time at the airport:

1. Check your phone. It must be unlocked and eSIM-compatible.
2. Install on home Wi-Fi. It takes about a minute. On iPhone with iOS 17.4 or later, it’s one tap in the Roamy app. Otherwise, scan the QR code or enter the code manually. Apple’s page on setting up eSIM on iPhone explains the options.
3. Leave it until you land. Validity starts when the eSIM first connects to a supported network in the UK. Each plan also has an “activate within” window, often 180 days.
4. Switch lines on arrival. Turn data roaming on for the Roamy line and keep it off on your home line, so it doesn’t run up roaming charges.

If something doesn’t connect, our guide on what to do when an eSIM is not working abroad walks through the usual fixes.

You can pay with Apple Pay, Google Pay, card or Roamy Credit, which pays first at checkout. Card payments earn 10% back as Roamy Credit, up to $20 an order (not with promo codes). Prices are in USD with everything included. If an eSIM can’t be issued after payment, it’s refunded, mostly automatically. For help, message us on WhatsApp or email support@roamyesim.com.

Get connected with Roamy

Roamy’s United Kingdom plans include fixed-data options you can top up and Unlimited day passes, all data-only and installed at home in about a minute. Open the United Kingdom eSIM page to see the networks, plan sizes and current prices, and land with your maps, tickets and messages ready to go.