🇬🇧 United Kingdom

Visiting the UK: what your carrier charges and where signal fails

Data in the UK without surprises: what EU, US and other visitors actually pay, coverage in the Highlands, Snowdonia and the London Underground, and the apps you need.

Updated on 15 September 2026 · 6 min read

The UK is a destination where a lot of visitors get a surprise on their bill, precisely because it feels like nothing should happen: it is close, it is well connected, and for years European visitors used data there exactly as they did at home. That changed with Brexit — and for visitors from further afield it was always international roaming. This guide covers what you will actually pay depending on where you are from, where coverage genuinely fails, and which apps are worth having.

What you pay depends on where your carrier is

If your carrier is in the EU. Until 2020 the UK sat inside the European roaming regulation and your tariff worked there as at home. Since 1 January 2021 it does not. No European rule obliges anyone to include it, so each carrier decided for itself: some kept the UK inside their EU zone, others moved it out with a daily pass or a separate charge. This is the single most common cause of unexpected bills here, and it takes two minutes to check.

If your carrier is in the US or Canada. The UK has always been international roaming for you. Some post-paid plans include data abroad at deliberately slow speeds — workable for maps and messaging, painful for anything else — and many prepaid plans include nothing at all. Check the UK by name rather than trusting a generic “international” line.

If you are coming from further afield — Australia, New Zealand, Latin America, Asia — expect a daily pass or per-megabyte charging, and do the multiplication against the length of your trip before deciding.

Your options

Roaming with your own carrier

Worth it if the UK genuinely sits in your included zone, or for a two- or three-day trip with a cheap daily pass. Beyond that the multiplication stops working.

A UK SIM

Easy to buy: supermarkets, phone shops and airport machines, with no paperwork beyond payment. Prices are competitive and coverage is good. The downsides are the usual ones: taking your own SIM out, losing your number for calls and texts, and spending your first hour finding a shop rather than getting into town.

Travel eSIM

You buy the days of the trip, install the QR at home on wifi and land connected as a roaming visitor. Your own line stays in the phone with its data off, so bank codes still reach you. For a trip of a few days to a few weeks it is the cleanest option, and it is the one that gets you onto the Heathrow Express or into an Uber without hunting for anything first.

Real coverage: who covers what, and where it fails

Four traditional networks: EE, which usually comes out best in rural coverage studies; Vodafone UK and Three UK, which merged in 2025 and are integrating their networks; and O2. Travel eSIMs connect to one of them; the plan page says which.

Excellent 4G and 5G coverage in London and all the large cities: Manchester, Birmingham, Liverpool, Leeds, Bristol, Edinburgh, Glasgow, Cardiff, Belfast. Good too on the motorways and most rail lines, though on trains there are constant micro-dropouts from tunnels and cuttings.

Where it genuinely struggles:

Scottish Highlands and the islands: the inland glens, much of Skye, Harris and Lewis, Mull. The villages have signal; between them, long stretches with nothing.
Eryri (Snowdonia) and inland Wales: entire valleys with no coverage.
Lake District and the Yorkshire Dales: fine in the villages, poor on the mountain routes.
The Cornish coast and the South West Coast Path: patchy along the cliffs.
The London Underground: coverage is being rolled out section by section, but there are still lines and tunnels with no signal. Many stations have free wifi.

And as always: an eSIM latches onto EE’s, Vodafone’s or O2’s network — it brings none of its own. Where there is no mast, no eSIM works, ours or anyone else’s. If you are walking in the Highlands or in Eryri, download the map and tell someone your route.

How much data you need

The UK is generous with wifi — museums, cafés, hotels, many stations — so real usage is often lower than expected in cities and considerably higher on a driving trip.

Type of trip	Typical use	Plan that fits
London and cities: maps, transport, messaging	200-400 MB a day	3-5 GB for a week
The above plus social posting daily	600 MB - 1 GB a day	10 GB for two weeks
Driving Scotland or Wales with navigation and music	Over 1.5 GB a day	Unlimited by days

The breakdown app by app is in how much data do I need for a trip.

Installing the eSIM and landing connected

Compatibility: dial *#06# and look for the EID; the phone must be carrier-unlocked. List by brand on compatibility.
Buy for the days of the trip: validity starts with the first connection in the UK.
Install at home on wifi. Name it “UK”.
Lines: your home line for calls and texts with its data off; the eSIM as mobile data with roaming on.
On landing: turn off airplane mode and wait to see “EE”, “Vodafone”, “Three” or “O2”.

Every menu, step by step, in how to install an eSIM.

Apps worth having

Citymapper for London, which beats general map apps for public transport, and Google Maps with the city downloaded.
Contactless payment is the transport system in London: you tap in and out with your own card or phone, with daily and weekly caps applied automatically. No Oyster card needed.
Trainline for rail tickets, where booking ahead makes a large difference to the price, and National Rail for live times and disruptions.
Uber, Bolt and Free Now in the large cities; black cabs also take contactless.
The Met Office app for weather, which in Scotland and Wales is not a detail but a planning tool.
Payments: contactless works virtually everywhere, including market stalls and small cafés. Cash is barely needed. Always be charged in pounds and decline conversion to your own currency.

Connectivity tips

Before walking in the Highlands, the Lakes or Eryri: download the map, carry a power bank, and leave your route with someone. These are not places where signal is a formality.
On trains, onboard wifi ranges from good to unusable depending on the operator: download what you want to read.
Bank verification texts arrive on your home line, which stays active and costs nothing to receive on.
If the trip includes the Republic of Ireland, a UK plan stops at that border: pick a plan covering both or a regional Europe one.

Rough price

The block at the top shows what a UK eSIM costs in the MovaSim catalogue today, with the unlimited-by-days option and the cheapest by gigabytes; the United Kingdom page has every plan and what each covers.

Frequently asked questions

I have an EU carrier. Is the UK still included in my tariff?

It depends on your carrier. Since 1 January 2021 the UK has been outside the European roaming regulation, and each company decided for itself: some kept it inside the EU zone and others took it out, with a daily pass or a separate charge. Check your specific tariff before flying; that is where most of the nasty surprises come from.

And if I am coming from the US, Canada or Australia?

Then the UK has always been international roaming for you. Some post-paid plans include data at reduced speeds; many prepaid ones include nothing. Look up the UK by name in your plan, not the generic 'international' line.

Is there coverage on the London Underground?

On more and more sections: Transport for London has spent years installing mobile coverage line by line and station by station, but there are still tunnels and platforms with no signal. Many stations do have free wifi.

What about the Scottish Highlands or Wales?

In the towns and on the main roads, yes. In the glens, across much of Skye, in the mountains of Eryri (Snowdonia) and on Lake District trails there are large areas with no signal from any carrier.

Do I need a UK number for anything?

Not for travelling: accommodation, trains and tickets all go by email. The odd local app asks for a verification text, and that arrives on your home line, which stays active and costs nothing to receive on.

Does a UK eSIM work in Ireland?

Northern Ireland is included (it is the UK); the Republic of Ireland is a different country and a different tariff. If your trip covers both, pick a plan that includes them or a regional Europe plan; the plan's page has the list.