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
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.
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
SIM-Only Deals UK: Why Rolling Plans Win
Price matters, but coverage matters more. Here's why monthly rolling multi-network SIM-only plans beat cheap single-network deals in 2026.
Blog · 6 min read
Why Your Mobile Signal Keeps Dropping
Discover why UK mobile networks' '99% coverage' claims don't match reality and what you can do about persistent signal problems.
Blog · 5 min read
Multi-Network SIM: Why One Isn't Enough
Single UK networks leave coverage gaps everywhere. Multi-network SIMs combine all four operators for truly reliable connectivity in 2026.
Blog · 6 min read
Rural Britain's Mobile Coverage Fix
Discover why rural mobile coverage UK remains patchy and how multi-network SIMs solve countryside connectivity challenges.
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.