eSIM UK: Comparing Your Options in Great Britain After Brexit (2026)

No, not by law. Since the Brexit transition period ended on 31 December 2020, Great Britain hasn't been covered by the EU roaming rules. If your German contract still works there without extra charges, that's your carrier's own choice.

The legal basis for "Roam Like At Home" is Regulation (EU) 2022/612, which extended surcharge-free roaming within the EU and EEA until 2032. By then the UK was already out. According to a briefing from the House of Commons Library, that renewed regulation was never adopted into UK law, since it was passed after the transition period had ended. Roaming between the EU and the UK has been a commercial matter for the networks ever since. No legal right, no special clause in the Brexit deal. The same briefing notes that the Windsor Framework for Northern Ireland didn't touch roaming either.

The German telecom site teltarif.de sums it up in one line (as of 17 August 2026): „Großbritannien gehört nicht zur gesetzlichen EU-Roaming-Zone“, meaning Great Britain isn't part of the statutory EU roaming zone.

That's really all you need to know.

The Brits have seen how fast that kind of goodwill can flip, just in the other direction. When UK carriers brought back roaming charges for trips to the EU after Brexit, Ernest Doku, mobiles expert at the comparison site Uswitch, called it "hugely disappointing" for consumers. Shortly after Brexit, the big providers had said they had no immediate plans to change their charging models. I think that's the most useful lesson in this whole topic. A promise with no law behind it is a snapshot.

A small side note, because people tend to miss it. If you travel from Dublin to Belfast, you move from statutory EU roaming (Ireland is an EU member) into exactly this goodwill zone, since Northern Ireland is part of the United Kingdom. For your plan those are two different worlds, even though you probably won't even slow down at the border. For the wider picture on EU roaming this year, see our overview of EU roaming changes in 2026.

According to the carriers themselves and teltarif.de, Telekom, Vodafone and O2 don't currently charge extra for the UK, as long as you stay within your included data. It's not quite that tidy, though. A second German source reports daily fees, O2 has an end date hanging over it, and we couldn't find an official statement for congstar. If you'd rather skip that back-and-forth, an eSIM UK gives you one fixed price up front, whichever account of the rules turns out to be right.

Table as of September 2026. These terms change, and at O2 they demonstrably change every year. So before booking, I'd always take one more look at your own plan details.

Vodafone and O2: two sources, two answers

This is where it gets awkward. teltarif.de says (as of 17 August 2026) that Telekom and Vodafone treat Great Britain like the EU at no extra cost. Vodafone confirms it on its own site: „Großbritannien bleibt auch nach dem Austritt aus der Europäischen Union Teil der EU-Roaming-Zone“, so Great Britain stays part of its EU roaming zone even after leaving the EU. And yet reisechip.de reported in July 2026 that Vodafone and O2 charge €5.99 per day for the UK through a tier called "Europa Plus."

Both can't be true for the same plan at the same time.

Which source is right? Honestly, I don't know. Maybe they're describing different generations of plans, maybe one of the pages is out of date. Neither text makes it clear, and I'm not going to crown a winner I can't back up. What the contradiction really tells you is this: even specialist German telecom press can't pin down UK terms consistently. That's the actual news here.

Let's run the numbers, in case the reported €5.99 per day applies to your plan. A week in London would then cost €41.93 extra, a two-week tour of Scotland €83.86. If it doesn't apply, you pay nothing on top. The whole uncertainty sits between those two outcomes, and in the end only your own plan details can settle it (or the hotline, as annoying as that is).

O2: the extension that never ends

The O2 help page is fairly open about it. Despite the UK leaving the EU, it says, only the Zone 1 (EU-regulated) price continues to be charged. Technically, though, O2 files the country under Zone 2, its pricier non-EU tier. The page documents the exception being extended from 2021 to 2022 and then to 2023. The current end date is 31.12.2026, again marked "extension not guaranteed," which teltarif.de also confirmed in August 2026. So O2's UK roaming deal stays a time-limited courtesy for now, not a permanent fixture. If you don't want to carry that risk, booking an eSIM UK for any 2027 trip is the simpler call.

O2 will probably extend it again. The pattern of the last few years points that way. But "probably" isn't much to go on for a trip in February 2027 that you're booking flights for right now.

Vodafone: the fair-use limit

Vodafone has a second catch that barely matters for a holiday but very much matters for a long stay. According to Vodafone, it may charge extra if your usage abroad exceeds your usage in Germany for four consecutive months. A semester abroad in Manchester is exactly that case.

congstar: no primary source here

As far as our research goes, congstar treats Great Britain as Zone 1 on both contract and prepaid plans. We couldn't review an official congstar page confirming that for this article, though, which is why the table says "not stated" for price. teltarif.de puts it generally: travellers should look especially closely at budget brands. I agree. If you want to understand how roaming works at congstar's parent company, our article What is data roaming at Telekom? explains the basics.

If your plan includes Great Britain at no extra cost and you stay within your data allowance, your home plan is hard to beat. An eSIM UK mostly pays off once uncertainty or duration come into play. I see five typical cases:

• Your trip is after 31.12.2026 and you're with O2. Right now, you simply don't know what'll apply on your travel dates.

• Your plan is one of those where daily fees like the €5.99 per day reported by reisechip.de kick in.

• You're staying longer, say for a semester or an internship. Fair use, again.

• You're on a budget brand and can't find a clear answer on the UK. (I wouldn't guess there. The bill at the end of the month is too annoying.)

• Your EU data allowance is tight and you want to tether your laptop while you're out and about.

One upside gets overlooked a lot. The eSIM runs alongside your regular SIM, so you stay reachable on your German number and keep getting SMS codes from your bank. Our guide on how to use an eSIM and SIM together and keep your number walks through how that works on your phone. The data roaming setting matters too, otherwise your phone may pull data through the German card after all. More on that in data roaming on or off with a travel eSIM.

For anything beyond the big cities, O2 (VMO2) has the widest geographic coverage, per an analysis by myamplifiers.com from September 2026, where it wins Opensignal's "Coverage Experience" award. EE ranks second, Three last. In London and other major cities, the gap is a lot smaller.

According to Ofcom's Connected Nations Report 2025, published on 19 November 2025 with data from July 2025, at least one operator reaches around 95% of the UK's landmass with 4G. Sounds pretty reassuring. The catch is in the words "at least one." If your eSIM happens to run on the network that's missing in that particular valley, the national figure won't help you much.

Many providers list which network your eSIM UK uses in the plan details. Sometimes it's a single network, sometimes several. I'd check there before buying. If O2 is listed, that's a real plus for a road trip and pretty irrelevant for a weekend in Camden.

This is the part where a lot of comparison sites just drop in a price table. I'm deliberately not doing that. UK eSIM prices change almost weekly, promo prices come and go, and a figure without a proper date is off-limits for us. I think the more useful question is which type of plan fits your trip. You'll see the current price for your eSIM UK on the provider's own site in about two minutes.

What would I check first on any plan? Whether the UK is actually included (sounds obvious, but with regional bundles it's the most common trap). Which network is named. Whether hotspot use is allowed, if you need it. And with unlimited plans, the fair-use limit, which can differ by destination.

Most guides to an eSIM for England stop at the edge of London. The interesting differences start right after it.

Do you need a separate eSIM for London?

No. An eSIM UK works nationwide, and London is simply part of that. As far as I can tell, offers marketed as a "London eSIM" or an "eSIM for England" are regular UK plans with a different label. Network choice also matters less in the capital than out in the countryside, so the cheapest suitable plan is usually fine there.

Scotland and Wales: where the gaps are

According to Ofcom's Connected Nations 2025, Scotland is the least well covered of the four UK nations. If you're looking for an eSIM UK for Scotland because the Highlands are on your route, the network matters more than the last gigabyte. Wales looks similar. The same Ofcom report puts 4G from all four operators at only about 76% of the area there, compared with around 90% in England. Flip that around and roughly a quarter of Wales is missing at least one of the four networks. Going by myamplifiers.com's ranking, an eSIM on O2 is your best bet there.

Northern Ireland

Northern Ireland does surprisingly well. Individual operators reach 94 to 96% geographic coverage there according to Ofcom, and outside buildings it's 97% with all four networks combined. For a trip to Belfast or the Giant's Causeway, the network question is pretty secondary. The roaming question from earlier matters more if you're coming up from Ireland.

Usually not automatically. The Isle of Man, Jersey and Guernsey are Crown Dependencies, as mybestsim.com explains, which makes them neither part of the United Kingdom nor the EU. So an eSIM UK generally doesn't just carry over.

Each island has its own mobile market, with Manx Telecom on the Isle of Man and Sure and JT on the Channel Islands. UK plans often treat the islands as international roaming destinations. For you, that means if the Isle of Man or Jersey is on your route, the island needs to appear explicitly in your eSIM's country list. Otherwise you'll need a separate bundle.

And your German carrier? Same story. We didn't check carrier by carrier which zone Telekom, Vodafone or O2 put the islands in for this article. But it isn't automatically the same zone as Great Britain. A quick look at your plan's country list can save you real trouble here.

The most relaxed way is to install your eSIM UK at home on Wi-Fi, before you're sitting on the plane or standing on the platform at St Pancras. On many plans the validity only starts with the first connection in the destination country, but each provider handles that a little differently in its terms.

Two checks first. Your phone needs to support eSIM, which you can see under the mobile or cellular settings if there's an option to add another plan or an eSIM. And it can't be SIM-locked, which still happens now and then with older contract phones. If a phone bought in Germany is tied to one carrier, that's the thing to sort out before the trip. The step-by-step guide for iPhone is in How to Activate an eSIM on iPhone: Step by Step. If you want the fundamentals first, our beginner guide How Does an eSIM Work Abroad? covers the basics.

• Weekend in London in 2026, Telekom or Vodafone contract with no UK surcharge: stick with your home plan.

• O2 and travelling from 2027: pencil in an eSIM UK once your dates are set.

• Scotland or Wales: book an eSIM UK on the O2 network, not just any plan.

• Semester abroad: get a UK contract or an eSIM with generous data, because of fair use.

• Isle of Man or Channel Islands: check the country list first, buy the bundle second.

Honestly, I find it absurd that in 2026 you have to dig through plan terms that get renewed every year just to spend a weekend in London. But that's the situation after Brexit, and no article is going to change it. Before you book, it's worth a look at your plan details. If there's a date next to Great Britain that falls before your return flight, an eSIM UK is the more relaxed choice.