Last updated: 10 June 2026

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Trying to find the best eSIM for UK travel in 2026? Whether you are a UK resident heading abroad or a visitor arriving in Britain, eSIM technology has made staying connected simpler, cheaper, and far less faff than swapping physical SIM cards at the airport. In this guide, we break down the top eSIM providers, which UK mobile networks support eSIM, and how three budget-friendly options can keep you online without burning through your holiday fund.

What is an eSIM and how does it work?

An eSIM (embedded SIM) is a tiny chip built into your phone during manufacturing. Instead of popping a plastic SIM card into a tray, you download a mobile plan digitally, usually by scanning a QR code or tapping through an app. Your phone stores the profile, connects to a network, and you are online within minutes.

Most modern smartphones support eSIM, including iPhones from the XS onwards and Samsung Galaxy models from the S20 onwards. To check yours, dial *#06# on your keypad. If an EID number appears, your device is eSIM-ready. The real beauty of eSIM for travellers is dual-SIM capability. You can keep your regular UK number active on your physical SIM while running a separate travel data plan on the eSIM. So your WhatsApp messages, banking apps, and two-factor codes all keep working in the background.

Best eSIM for UK travel: top providers in 2026

The travel eSIM market has exploded over the past couple of years, and not every provider is worth your money. After digging into pricing, network coverage, and real-world reviews, here are the standout options for 2026.

Holafly

Holafly is one of the most recognisable names in the travel eSIM space, and for good reason. They offer unlimited data plans priced by number of days, making budgeting dead simple. Plans cover 200+ destinations, including broad European packages ideal for multi-country trips. The trade-off? Hotspot use is limited, and heavy data usage may see speeds throttled under fair-use policies. Still, for casual browsing, maps, and messaging, Holafly is a reliable pick.

Airalo

Airalo operates as a marketplace, letting you compare plans from multiple local operators in one app. For the UK specifically, their plans connect to networks like EE, Three, and Vodafone. Data-only plans start from around $4.50 for 1GB, while larger packages bring the cost per gigabyte down significantly. Airalo is especially handy if you want flexibility and like choosing your own network.

Saily

Built by the team behind NordVPN, Saily pairs travel data with a built-in VPN and ad blocker. It connects to EE and Three in the UK, delivering strong speeds in testing. Plans start from around $3.99 for 1GB, with 20GB options available for longer trips. If online security matters to you as much as connectivity, Saily is worth a closer look.

Sim Local

Sim Local stands out because their UK eSIMs run on EE and Three directly, offering plans that include voice, text, and data. That means you get a UK phone number alongside your data, which is particularly useful for visitors who need to make local calls. A 200GB EE plan for 30 days costs around $38, which is excellent value. For visitors coming to the UK, Sim Local is arguably the best overall option.

Ubigi

Ubigi offers both pay-as-you-go and subscription plans, with 5G support in the UK. Their unlimited 5G plan runs at around £36 for 30 days, making it a strong choice for anyone who needs fast speeds and heavy data usage. It is a slightly more premium option, but the 5G access justifies the price in areas with good coverage.

Best eSIM for visitors coming to the UK

If you are visiting Britain from abroad, a travel eSIM saves you from hunting for a SIM card shop at Heathrow. The best approach is to buy and install your eSIM before you fly, then simply switch it on when you land.

For visitors, Sim Local and Airalo are the strongest choices. Sim Local's EE-powered plans give you voice, text, and data in a single package, while Airalo lets you pick from several UK operators to suit your coverage needs. Holafly works well too if you just need unlimited browsing and do not care about having a UK phone number. Additionally, all four major UK networks (EE, Vodafone, Three, and O2) support 5G, so you will get fast speeds in cities like London, Manchester, Edinburgh, and Birmingham.

UK residents going abroad: why eSIM beats roaming

Here is where things get interesting for UK travellers. Since Brexit, there is no legal requirement for UK mobile networks to offer free EU roaming. While some providers voluntarily kept it going for a while, the landscape has shifted considerably. In 2026, most major networks either charge a daily roaming fee or cap how much data you can use abroad.

For example, EE charges £2.47 per day for their Roam Abroad pass in Europe, while Vodafone applies a similar daily fee of around £2.25. A two-week holiday for a couple could easily add £70 or more to your phone bill just for basic data access. That is before you even think about destinations outside Europe, where charges climb higher still.

A travel eSIM sidesteps all of this. You buy a prepaid data plan from a provider like Holafly, Airalo, or Saily, install it before you leave, and use it alongside your UK SIM. No roaming fees, no surprise bills, no stress. If you are planning a trip to Europe or beyond, an eSIM is one of the smartest money-saving moves you can make. For more ways to cut your regular bills before you travel, our guide to the best SIM-only deals in the UK is worth a read alongside this one.

Which UK mobile networks support eSIM?

The good news is that eSIM support across UK networks is now widespread. All four major operators fully support it, along with a growing list of smaller providers.

Full eSIM support in 2026: EE, Vodafone, Three, O2, giffgaff, SMARTY, Honest Mobile, VOXI, iD Mobile, Sky Mobile, Lebara, Lyca Mobile, Tesco Mobile, spusu, Talkmobile, and ParentShield.

Activation varies by network. Some, like giffgaff and VOXI, let you set up entirely through their app. Others, like EE, may require a call to customer service or an in-store visit depending on your plan type. In general, the process involves receiving a QR code, scanning it in your phone settings, and waiting a few minutes for the profile to activate. Ofcom regulations also mean you can transfer your number between networks using a PAC code, so switching to an eSIM-friendly provider is straightforward.

Budget-friendly UK networks with eSIM: Honest Mobile, SMARTY, and giffgaff

If you are looking for an affordable everyday UK plan that also supports eSIM, three networks deserve your attention. All three offer no-contract flexibility, competitive pricing, and genuine eSIM support. Better still, they each bring something slightly different to the table.

Honest Mobile

Honest Mobile is the UK's first B Corp mobile network, and they take both sustainability and simplicity seriously. Their Classic SIM plans come with unlimited calls and texts, with data options at 4GB (from £10/month), 10GB, or Unlimited (£25/month). Both physical SIM and eSIM are available from the start. On top of that, they offer a unique product called Smart SIM, a data-only eSIM that accesses all four major UK networks (EE, O2, Three, and Vodafone) and provides free roaming for 500+ apps in 180+ countries. It is designed to work as a backup alongside your main SIM. Honest also reduces your bill by 5% every year you stay, which is a refreshing change from the annual price hikes most networks impose. Their Classic plans include 5 free days of EU roaming per trip.

For the full lowdown on Honest Mobile and how to get started, check out our service guide:

Get the Honest Mobile referral deal

SMARTY

SMARTY runs on Three's network and has built a loyal following thanks to its transparent pricing and no-contract approach. They introduced eSIM support in September 2025, and new customers can now order an eSIM directly during sign-up without needing a physical SIM first. Plans are remarkably affordable, and all include free EU roaming with a 12GB data allowance. Because SMARTY uses Three's infrastructure, you get the same coverage and 5G access as Three customers, often at a significantly lower price. It is a particularly strong choice if you travel to Europe regularly and want roaming included without paying extra.

See how SMARTY stacks up and grab a referral bonus through our guide:

Get the SMARTY referral deal

giffgaff

giffgaff is arguably the most flexible budget network in the UK. Running on the O2 network, it offers rolling 30-day Goodybag plans with no credit checks and no contracts. Their eSIM support is now fully available to both new and existing customers through the giffgaff app or website. Plans start from just £6/month for 2GB, with unlimited data at £20/month. All Goodybags now include 5G as standard. For EU roaming, giffgaff includes free use of your allowance in the EU up to 25GB, which is one of the most generous caps among budget networks. The community-driven support model is not for everyone, but the value is hard to beat.

Head to our giffgaff guide to learn more and get set up:

Explore the giffgaff guide

How to set up an eSIM on your phone

Setting up an eSIM is quicker than you might expect. On an iPhone, go to Settings, then Mobile Data (or Cellular), then Add eSIM. You will be prompted to scan a QR code provided by your network or eSIM provider. On Android, the path is usually Settings, then Connections or Network, then SIM Manager, and then Add eSIM. Once scanned, the profile downloads in a couple of minutes and you are ready to go.

A couple of tips worth knowing: always set up your eSIM while connected to Wi-Fi, and make sure your device software is up to date before you start. If you are installing a travel eSIM for a trip, do it the day before you fly so you can troubleshoot at home rather than scrambling at the airport.

Frequently asked questions

Can I use an eSIM with giffgaff?

Yes. giffgaff rolled out full eSIM support in late 2025. Both new and existing customers can activate an eSIM through the giffgaff app or website. All Goodybag plans, including pay-as-you-go, support eSIM at no extra cost.

Do I need an eSIM to travel abroad?

You do not strictly need one, but it is one of the cheapest and most convenient ways to get data abroad. Since most UK networks now charge daily roaming fees in Europe post-Brexit, a travel eSIM from providers like Holafly, Airalo, or Saily can save you a significant amount over a one or two-week trip.

Which UK networks support eSIM in 2026?

All four major networks (EE, Vodafone, Three, and O2) support eSIM, alongside MVNOs including giffgaff, SMARTY, Honest Mobile, VOXI, iD Mobile, Sky Mobile, Lebara, Lyca Mobile, spusu, Talkmobile, and Tesco Mobile. Most newer smartphones from Apple and Samsung are compatible.

Does SMARTY support eSIM?

Yes. SMARTY launched eSIM support in September 2025. New customers can order an eSIM directly when signing up, and existing customers can swap from a physical SIM through their SMARTY dashboard.

Is a travel eSIM better than using my UK network's roaming?

In most cases, yes. Travel eSIM plans typically cost a fraction of what you would pay in daily roaming charges. For instance, a 5GB Airalo plan for Europe might cost around £10 to £15, while roaming fees from EE or Vodafone could run £2 to £3 per day. Over a week, the savings add up quickly.

Can I use two eSIMs at the same time?

Most modern phones support dual-SIM functionality, letting you run your regular UK plan alongside a travel eSIM simultaneously. This means you keep your UK number for calls and texts while using the travel eSIM for data. Check your phone's settings to confirm it supports this feature.

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Published by Tristan in Comparison, Comparisons, Mobile Networks, Money saving, Tech Hacks, Technology lover, Travel, Travel lover
Tags: eSIM, eSIM UK, EU roaming, giffgaff, Honest Mobile, mobile data, roaming charges, SIM only, Smarty, travel eSIM, travel tips, UK travel