99.8% UK coverage
More signal than any single carrier — across cities, motorways, train lines and rural villages. We pool four networks so the gaps don’t add up to a black hole.
vs ~78% single network
Coverage · Ofcom coverage data
Real signal data.
From all four networks.
Most providers only show you their own coverage. We show you EE, Three, Vodafone and O2 together — then connect you to whichever is strongest where you are.
The difference
One network leaves holes.
Four networks fill them.
Every UK carrier has dead zones — different ones. Fuse pools EE, Three, Vodafone and O2 so where one drops, another picks you up.
One network
~78%
UK coverage
Single-carrier UK coverage.
- Stuck with one network’s dead zones
- No fallback when signal drops
- Locked-in contracts to switch
Fuse
99.8%
UK coverage
All four networks, one eSIM.
- Always on the strongest available signal
- Sub-second handoff between networks
- 30-day rolling — cancel any time
Why people switch to Fuse
One network isn’t enough.
Four working together is.
Traditional carriers lock you into their map. Fuse gives you the combined map of all four UK networks — so you’re on the best one for where you are, automatically.
Sub-second auto-switch
Your phone holds four network identities and switches to the strongest in real time. No app, no settings, no thought.
Background switching, always on
Cancel any time
30-day rolling. No contract, no exit fees, no credit check. If Fuse isn’t for you, you’re out the next month — clean.
Switch back free, no questions
Try it free
Seven days of multi-network data.
No card charged until day 8.
Scan a QR code, set Fuse as your data line, and try it on every signal in your week — commute, office, sofa, train. Cancel from your inbox if it isn’t for you.
Networks Fuse uses
EEThreeVodafoneO2
Roaming included
One plan. Everywhere.
The strongest UK signal at home — and your data, free, in 120+ countries abroad. Pulse and Surge include roaming, so the same allowance you use here keeps working the moment you land. Spark is UK-only.
- No travel eSIM to buy
- No roaming fees
- Same number, same eSIM
- 43
- Europe
- 28
- Americas
- 16
- Asia Pacific
- 29
- Middle East & Africa
The four networks behind Fuse
We don't build towers. We aggregate the best of the UK's four major networks into one eSIM, so you never have to pick.
EE
EE
The UK's largest 4G network with extensive 5G rollout across major cities.
3
Three
Strong 5G coverage in urban areas with competitive data speeds.
V
Vodafone
Reliable nationwide coverage with excellent rural signal strength.
O₂
O2
Wide-reaching network trusted by millions, with growing 5G availability.
Coverage by city
Detailed coverage info for 25 UK cities — postcode areas, region context, and how multi-network helps where one provider is weak. If your signal keeps cutting out, here's why your mobile signal is so bad and what fixes it.
Fuse combines all four major UK networks — EE, Three, Vodafone, and O2 — into a single eSIM. Instead of relying on one network, your phone can connect to whichever has the strongest signal at your location. By pooling the coverage maps of four networks, we cover over 99% of the UK population.
Fuse connects to all four major UK mobile networks: EE, Three, Vodafone, and O2. These are the same networks that power virtually every other UK mobile provider, but Fuse gives you access to all of them rather than locking you into just one.
Yes. Your phone continuously monitors signal strength in the background and connects to the best available network automatically. You don't need to change any settings or manually switch — it all happens seamlessly without interrupting your data session.
Yes. Fuse supports 5G wherever it's available on any of the four UK networks. As EE, Three, Vodafone, and O2 continue to expand their 5G rollouts, your Fuse eSIM automatically gains access to those new 5G areas — no action needed on your part.
Use the coverage checker at the top of this page. Enter your postcode and we'll show you which of the four networks have signal in your area, including 4G and 5G availability. With Fuse, if any of those networks cover your location, you're covered.
No. Every Fuse plan — from Spark to Surge — includes full access to all four UK networks. There are no coverage restrictions based on your plan. The only difference between plans is the amount of data included each month.
More on UK coverage
4G Home Broadband SIM: A UK Guide
A practical UK guide to using a 4G home broadband SIM in a router — who it suits, how to set it up, and why multi-network coverage matters.
Blog · 6 min read
Best Data SIM for a Tablet or Router
A data SIM for your tablet, iPad, or MiFi router changes everything — here's how to choose the right one and why multi-network coverage matters.
Blog · 6 min read
Data-Only SIM UK: The Complete Guide
Looking for a data-only SIM in the UK? Here's what to look for, the best use cases, and why multi-network coverage changes everything.
Blog · 6 min read
How Many Mobile Networks Are There in the UK?
There are four mobile networks in the UK — EE, Three, Vodafone, and O2. Here's what that means for your coverage, and why most people don't realise which one they're on.
Blog · 6 min read
Coverage in 60 seconds
If any of the four networks reach you,
Fuse does too.
Pick a plan, scan a QR code, you're on the best signal where you are.
No contract. Cancel anytime.