The short verdict
For most visitors to the UK, Flysimio on EE — the UK's largest and fastest network — is the best combination of quality and price, and the price index below shows the working with every rival price dated and linked. One finding worth stating plainly: for the UK specifically, both Airalo and Holafly now sell unlimited-data passes rather than fixed-data plans, so there is no competing price per gigabyte to rank against. The honest comparison is a capped plan against an unlimited pass. Holafly makes sense if you stream or hotspot heavily; Airalo's "Unlimited" throttles after 3 GB a day, Holafly's does not.
Flysimio United Kingdom eSIM
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UK eSIM price index — August 2026
Across 3 providers and 11 plans compared in August 2026, the cheapest UK eSIM data on a standard 3–50 GB plan works out at $0.85/GB (Flysimio, priced live). Every other provider in this market sells unlimited-data passes rather than fixed-data plans, so there is no competing price per gigabyte to rank against.
| Provider | Plan | Price | Price per GB | Network | Best for | Price checked |
|---|---|---|---|---|---|---|
| Flysimio | 50 GB / 30 days | $42.50 | $0.85/GB | O2 / T-Mobile UK / 3 | Live | |
| Flysimio | 20 GB / 30 days | $20.50 | $1.02/GB | O2 / T-Mobile UK / 3 | Live | |
| Flysimio | 10 GB / 30 days | $10.70 | $1.07/GB | O2 / T-Mobile UK / 3 | Live | |
| Flysimio | 5 GB / 30 days | $5.95 | $1.19/GB | O2 / T-Mobile UK / 3 | Live | |
| Flysimio | 3 GB / 15 days | $3.75 | $1.25/GB | O2 / T-Mobile UK / 3 | Live | |
| Flysimio | 1 GB / 7 days | $1.43 | $1.43/GB | O2 / T-Mobile UK / 3 | Live | |
| Airalo | Unlimited (3 GB/day) / 7 days | $27.00 | — | EE | Coverage & app | Aug 14, 2026 |
| Holafly | Unlimited / 7 days | $27.50 | — | EE / Vodafone / O2 / Three | Unlimited data | Aug 14, 2026 |
| Airalo | Unlimited (3 GB/day) / 30 days | $69.00 | — | EE | Coverage & app | Aug 14, 2026 |
| Holafly | Unlimited / 30 days | $73.90 | — | EE / Vodafone / O2 / Three | Unlimited data | Aug 14, 2026 |
| Flysimio | Unlimited (2 GB/day) / 30 days | $75.90 | — | O2 / T-Mobile UK / 3 | Live |
- Airalo · Unlimited (3 GB/day) / 7 days: Airalo bills this as "Unlimited": 3 GB per day at full speed, then throttled to about 1 Mbps. Airalo's UK store lists unlimited packages only — it has no fixed-data UK ladder to compare.
- Holafly · Unlimited / 7 days: Unlimited with no daily high-speed cap; Holafly applies a fair-use policy for at most one day at a time.
- Airalo · Unlimited (3 GB/day) / 30 days: Airalo bills this as "Unlimited": 3 GB per day at full speed, then throttled to about 1 Mbps.
- Holafly · Unlimited / 30 days: Unlimited with no daily high-speed cap; Holafly applies a fair-use policy for at most one day at a time.
- Flysimio · Unlimited (2 GB/day) / 30 days: 2 GB per day at full speed, then 1 Mbps. Sold as 1–30-day passes; 30 days is priced here for comparison.
How this table is priced. Flysimio prices are read live from our carrier catalog every time this page loads, so the figure here is the figure at checkout. Competitor prices are the US-dollar price shown on each provider's own site, read on the date in the last column and linked to the page we read it from; promotional prices are marked alongside the list price. Price per GB is the plan price divided by its included data — unlimited passes have no per-GB figure and are ranked by total price instead. Full method: how we test, the eSIM Price Index and what an eSIM costs.
- Airalo — checked Aug 14, 2026 — www.airalo.com/united-kingdom-esim
- Holafly — checked Aug 14, 2026 — esim.holafly.com/esim-united-kingdom/
Which UK carrier does your eSIM use?
The UK has four major carriers: EE (owned by BT), O2 (owned by Virgin Media O2), Vodafone, and Three. EE is the largest with the most extensive 5G rollout — 50+ UK towns and cities. O2 has strong coverage in major cities and is the main carrier for the London Underground. Vodafone is mid-tier nationally. Three has the most competitive pricing for heavy data users but less rural coverage. Hopping over to Dublin? The Republic of Ireland needs its own plan — see our best eSIM for Ireland, including how Vodafone Ireland handles visitor eSIMs.
| Carrier | Best for | 5G cities | Rural coverage |
|---|---|---|---|
| EE | Overall quality, Scotland, Wales | 50+ cities | Best in UK |
| O2 | London Underground, cities | 20+ cities | Good but patchy |
| Vodafone | General urban use | 25+ cities | Average |
| Three | Heavy data users | 140 cities | Weakest |
Which UK eSIM plan for your trip?
| Trip type | Recommended | Why |
|---|---|---|
| Long weekend in London | Flysimio 3 GB / 7 days | Maps, Tube navigation, social — 3 GB is enough |
| 2-week England + Scotland road trip | Flysimio 10 GB / 30 days | Rural EE coverage is essential; 10 GB for navigation |
| Scottish Highlands hiking | Flysimio 5 GB on EE | EE has best rural UK signal; vital for safety on remote routes |
| Business trip (hotspot for laptop) | Holafly unlimited | Unlimited + hotspot for laptop use |
| Multi-country (UK + Ireland) | Separate UK + Ireland eSIMs | Ireland is not covered by UK eSIMs — it is a different country |
5G coverage in the UK
EE has 5G in London, Birmingham, Manchester, Leeds, Glasgow, Edinburgh, Cardiff, Belfast, and 40+ additional towns. In rural areas — the Scottish Highlands, North Wales, the Dales, Dartmoor — 5G drops to 4G LTE, and in the most remote areas to 3G. For hiking and remote travel, the EE network gives you the best chance of signal on cliff paths, mountain passes, and country roads.
Installing your UK eSIM
- Purchase before you fly — you need Wi-Fi to scan the QR code.
- Open the Flysimio email and find the QR code attachment.
- iPhone: Settings → Cellular → Add eSIM → Use QR Code.
- Android: Settings → Network & Internet → SIMs → Add SIM.
- Scan the code. Installation takes 10–30 seconds.
- Label the eSIM "UK" and set it as your data line.
- Turn off Data Roaming on your home carrier SIM.
- When you land at Heathrow, Gatwick, Manchester, or Edinburgh, your phone connects to EE automatically.
Frequently asked questions
What is the best eSIM for the UK?
Flysimio is the value pick for a fixed-data UK eSIM in 2026, reaching EE, O2 and Three. As of August 2026 neither Airalo nor Holafly sells a fixed-data UK plan — both are unlimited-only — so there is no competing price per gigabyte to rank against. If you want unlimited, note that Holafly does not throttle after a daily cap while Airalo does.
Which eSIM uses EE in the UK?
Flysimio and Airalo both route through EE for UK plans. EE is the largest UK network with the most extensive coverage in rural England, Scotland, and Wales.
Does Holafly work in the UK?
Yes. Holafly offers unlimited data plans for the UK on the O2 network. O2 is strong in London and major cities but falls behind EE in rural Scotland and Wales. For city-focused travel, Holafly's unlimited plan is good value.
Do I need a UK SIM card or can I use eSIM?
eSIM is the better choice for most visitors. It is cheaper than airport SIM kiosks, no SIM-swapping required, and your home SIM stays active for calls. The only reason to buy a physical UK SIM is if your phone does not support eSIM.
Is there eSIM coverage in rural Scotland?
Yes on EE. EE has the best rural UK coverage of any carrier — including signal in parts of the Scottish Highlands, Skye, and Orkney. Remote glens and island interiors may have 3G or no signal, but EE gives you the best chance of connectivity on remote routes.
Does the UK eSIM work in Northern Ireland?
Yes. Northern Ireland is part of the United Kingdom and is covered by UK eSIM plans. Belfast and surrounding areas have strong 4G LTE. The Republic of Ireland is a separate country and requires a separate eSIM or an EU regional plan.
Which eSIM should I buy for the UK?
Flysimio's 5 GB plan on EE — the UK's largest and fastest network — is the best mix of network quality and price we found. Airalo is slightly more expensive on the same network.
Is an eSIM worth it for a short trip to the UK?
Yes. Around $7.50 for 5 GB on EE beats typical roaming charges within the first day or two, installs by QR before you fly, and connects automatically when you land — no SIM swap needed.
Maya Okafor
Senior Travel Connectivity Editor
Maya has tested eSIMs across 40+ countries over five years of full-time travel — from Tokyo subways to Patagonian backroads. She runs Flysimio’s hands-on network and speed testing.