Best eSIM for UK Travel in 2026: Prices, Networks and How to Choose

The best eSIM for UK travel is a prepaid, data-only plan on a major UK network (EE, Vodafone, O2 or Three) that you install at home before you fly and size to your trip: about 1 GB for a weekend, 3 GB for a week and 5 GB for two weeks. On callmins, UK plans start at $0.75 and a plan that covers a typical week costs $3.75 (3 GB, 15 days), paid once with nothing to renew. A UK pay-as-you-go SIM is better value only if you are staying a month or longer.

This guide covers how much data you really need, which networks a UK eSIM uses, what plans cost here and elsewhere, how to install one on iPhone and Android, and the one thing every data-only eSIM leaves out: a phone number.

The short answer, by traveller

How a UK travel eSIM works

An eSIM is a SIM profile you download instead of a plastic card you insert. Your phone keeps its normal SIM and adds the travel eSIM as a second line. You point mobile data at the eSIM, and it connects to a UK network as a roaming partner, so you pay the plan price and nothing else.

Three details trip people up:

• The clock starts on arrival, not purchase. Validity begins when the eSIM first connects to a network in the UK, so installing a week early costs nothing.
• Data roaming must be on for the eSIM line. The eSIM is technically roaming on a UK network. Turn data roaming on for the eSIM and off for your home SIM.
• The phone must be unlocked. A phone locked to your home carrier will refuse a second carrier's eSIM.

How much data you need in the UK

Most people overbuy. Navigation, messaging, ride-hailing and train tickets use very little data; video is what burns through a plan. Streaming or video calling can use 1 GB an hour or more, while a full day of maps and messaging usually stays well under that. Free Wi-Fi is common in UK hotels, cafés, trains and most Tube stations, which stretches a small plan further.

If you run out, you can buy another plan in the app and switch to it in a couple of minutes, so starting small is low-risk.

What a UK eSIM costs on callmins

These are the cheapest UK plans that cover each trip above, taken from our live catalogue. Prices are in US dollars and refresh every hour.

There are no activation or roaming fees on top, and nothing renews automatically. See every plan on the UK travel eSIM page.

What other travel eSIMs charge for the UK

For context, here is what three well-known providers list for the UK. We read these on their own pages; currencies are as each site showed them to us, and every provider changes prices often, so check before you buy.

Unlimited plans make sense if you stream or tether heavily every day. For maps and messaging, a fixed-data plan sized to your trip is almost always cheaper, and "unlimited" plans often slow you down after a daily fair-use amount.

Which UK networks a travel eSIM uses

The UK has four mobile networks: EE, Vodafone, O2 and Three. Vodafone and Three merged in 2025 and are joining up their networks, so you may see either name. Travel eSIMs don't build their own masts; they buy access to one or more of these.

• Cities, towns and main rail lines: all four are reliable, with 5G in most city centres.
• Rural Scotland, Wales, the Lake District and national parks: coverage gets patchy on every network. EE and Vodafone generally reach further.
• The London Underground: mobile coverage now reaches many tunnels and stations, and most stations have Wi-Fi, but expect dead spots between some stops.

A plan that can switch between more than one network is the safer pick for road trips and hiking. callmins UK plans connect to the strongest available partner network.

Travel eSIM vs roaming vs a UK SIM card

Two checks before you buy anything. First, look at your current plan: some US, Canadian and Australian plans already include UK roaming. Second, if you are coming from the EU, remember that EU "roam like at home" rules stopped covering the UK after Brexit. Some EU carriers still include the UK; many now charge.

The catch: a travel eSIM has no phone number

Almost every travel eSIM, ours included, is data only. That is fine for WhatsApp, FaceTime and Google Maps, but it leaves three gaps that competitor round-ups rarely mention:

• Bank and app codes still go to your home number by SMS. Keep your home SIM switched on for texts, with data roaming off on that line. Receiving texts abroad is free or cheap on most plans, but check yours.
• UK businesses call UK numbers. Restaurants, hotels, couriers, letting agents and tour operators often want a local number and may not call abroad.
• Calling UK numbers from your home number costs international rates.

The fix is a UK virtual number in the callmins app ($3.00/month, no setup fee). It rings over your eSIM's data, lets you call UK landlines and mobiles at our pay-as-you-go rates, and keeps working after you fly home. Your eSIM, number and wallet all live in the same app.

How to install a UK eSIM on iPhone

Do this at home over Wi-Fi, a day or two before you travel. You need the QR code or install link from your provider; in callmins it is under eSIM Data → My eSIMs.

1. Open Settings → Mobile Service (called Cellular on US iPhones) and tap Add eSIM.
2. Choose Use QR Code and scan the code shown on another screen. On the same phone, tap the install link instead, or use Enter Details Manually with the SM-DP+ address and activation code.
3. Label the new line, for example UK data.
4. When asked, keep your home line as the default for calls and texts, and pick UK data for mobile data. Turn off Allow Mobile Data Switching.
5. After landing, open Settings → Mobile Service → UK data, make sure the line is on and switch Data Roaming on. Check that Data Roaming is off on your home line.

Stuck on an error? Our step-by-step guide to installing an eSIM on iPhone covers every iOS message and fix.

How to install a UK eSIM on Android

Menu names vary by brand. These are the paths on the two most common:

Samsung Galaxy

1. Settings → Connections → SIM manager → Add eSIM.
2. Tap Scan QR code from service provider and scan it, or enter the activation code manually.
3. Under SIM manager, set Mobile data to the UK eSIM and keep calls and texts on your home SIM.
4. On arrival: Settings → Connections → Mobile networks → Data roaming on for the eSIM.

Google Pixel

1. Settings → Network & internet → SIMs → Add SIM (or + Add eSIM), then Download a SIM instead? if asked.
2. Scan the QR code and confirm the download.
3. Open the new SIM, turn on Mobile data and, once in the UK, Roaming. Turn mobile data off on your home SIM.

If the eSIM won't connect after landing

1. Check the eSIM line is switched on and selected for mobile data.
2. Turn on Data Roaming for the eSIM line. This is the cause nine times out of ten.
3. Toggle Airplane Mode on for ten seconds, then off.
4. Set network selection to Automatic, or pick EE, Vodafone, O2 or Three manually.
5. Restart the phone. If it still fails, contact support with the eSIM's ICCID.

Don't delete the eSIM while troubleshooting: most profiles can only be installed once.

Pros and cons of a UK travel eSIM

Pros

• Online the moment you land, with no airport queue or shop visit.
• A fixed price you see before you pay; no roaming bill afterwards.
• Your home SIM stays in the phone, so you keep your number for texts.
• Hotspot works, so a laptop or tablet can share the data.
• Top up or buy another plan from your phone if you run out.

Cons

• No UK phone number on data-only plans (see the fix above).
• Needs an unlocked, eSIM-capable phone.
• For stays of a month or more, a UK pay-as-you-go SIM is usually cheaper per GB.
• A UK-only plan doesn't work in the Republic of Ireland or mainland Europe.
• Most profiles install once; delete one and you may need a new plan.

Going on to Ireland or Europe?

A UK plan covers England, Scotland, Wales and Northern Ireland. Cross into the Republic of Ireland and it stops working. Near the Northern Ireland border your phone can also latch onto an Irish network by accident, which a UK-only plan won't cover.

In our catalogue right now, a week-long plan that covers the UK, Ireland and most of Europe (33 countries) starts at $1.60 for 1 GB over 7 days. Regional plans like this are listed below the UK-only ones when you search the UK in the app.

• eSIM for Ireland (from $0.80): Vodafone, Three, Eir
• eSIM for France (from $0.75): Orange, SFR, Bouygues Telecom
• eSIM for Netherlands (from $0.80): KPN, Vodafone, Odido
• eSIM for Spain (from $0.80): Movistar, Vodafone, Orange
• All 40+ travel eSIM destinations

How to get a UK eSIM on callmins

1. Create a free account and add credit to your wallet.
2. Open eSIM Data, search United Kingdom and pick a plan by data and days.
3. Install it at home using the steps above. The days start when you land.
4. Optional: add a UK number for calls and texts over the same data.

Get a UK eSIM →

Common questions

How we put this guide together

callmins prices on this page come straight from our eSIM catalogue and refresh every hour; if the catalogue can't be reached, we show no number rather than an old one. Competitor prices were read on each provider's own UK page on 3 November 2026. Data guidance is a starting point based on typical app use, not a guarantee.