Spark
Backup data.
5.99/mo
5 GB per month
- All four UK networks
- Auto-switching to the strongest signal
- 7-day free trial
- UK only
4 networks. One eSIM.
Every network.Fused.
Your phone connects to EE, Three, Vodafone, and O₂ through a single eSIM. It automatically picks the strongest signal wherever you are — so you never lose connection again.
No contract. Cancel anytime.
Fuse
now
Network switched
EE → O₂
In Plain English
Fuse Mobile is a UK multi-network data-only eSIM. It uses all four UK mobile networks — EE, Three, Vodafone, and O₂ — and connects your phone to whichever has the strongest signal, automatically.
Live · currently usingEEThreeVodafoneO₂
- 4 UK networks
- EE, Three, Vodafone, O₂
- 99.8% coverage
- Of UK population, Ofcom data
- 7-day free trial
- Card held, not charged
- No app limits
- Streaming, social, work
The problem
Every UK network has dead zones.Yours has them where you are.
You know the moments.
The coverage map
17% of the UK has no reliable 4G from any single network (Ofcom). Every UK network has weak-signal gaps — they just don’t line up.
EE
Three
Vodafone
O₂
CoveredDead zoneLive failure
Every UK network has gaps in different places. Ofcom data shows 17% of the UK has no reliable 4G from any single one.
Sound familiar?
Maps drops at the junction
Driving somewhere new, navigation cuts out right before the exit. By the time signal comes back you’ve missed the turn.
Asking the table for hotspot
Sat in the café with four bars, nothing loads. By the third refresh you’re asking if anyone can share their hotspot.
Messages arrive in batches
Office basement. Watford tunnel. Sleeping. Twelve WhatsApps buzz at once when you finally come out.
Each network covers different places. None covers them all.
The fix
Fuse uses every UK network.
The strongest one, always.
You stop noticing dead zones. Fuse handles them in the background.
Every UK network, in one eSIM
Fuse holds EE, Three, Vodafone, and O₂ in a single connection. No more being stuck with whichever provider you signed up with.
About multi-network eSIMThe strongest one, every second
Wherever you are, Fuse uses whichever network has the best signal. You don’t choose. You don’t switch.
See coverage in your areaA backup ready, always
When the network you’re on weakens, Fuse slides you onto a stronger one. You never see “no service” again.
Try Fuse free for 7 days
The four networks
EE. Three. Vodafone. O₂.
One Fuse eSIM, one connection.
Which UK networks does Fuse use? All four — and you always get the strongest one.
Coverage
Check Fuse coverage at your address. Before you sign up.
Enter your postcode. See real Ofcom signal data on all four networks near you. Takes 60 seconds.
Setup
Get Fuse running
in under a minute.
Download the app, sign up, install the eSIM. No shop, no SIM in the post.
- 01
Download the Fuse eSIM app
App Store on iPhone, Google Play on Android — same one-tap install either way. No shop visit, no SIM in the post.
- 02
Sign up in the app
Email and a password. The whole account-creation flow takes about 20 seconds — the app walks you through it.
- 03
Choose your plan
Spark, Pulse, or Surge. Switch between them anytime — your eSIM doesn’t change.
- 04
Install the eSIM on your phone
Tap “Install eSIM” in the app and the eSIM lands straight onto your iPhone or Android. You’re live on every UK network seconds later.
Plans & pricing
Fuse plans for every UK network.
No contract.
Plans from £5.99 a month — a cheap UK eSIM that uses every network, not just one.
Pulse
Most people.
9.99/mo
10 GB per month
- All four UK networks
- Auto-switching to the strongest signal
- 7-day free trial
- Roaming included
Surge
Heavy use, streaming, hotspot.
14.99/mo
15 GB per month
- All four UK networks
- Auto-switching to the strongest signal
- 7-day free trial
- Roaming included
- Rolling monthly
- Cancel anytime in the app
- No hidden fees
Who it’s for
Built for the places
signal drops.
If one of these scenes sounds familiar, Fuse is for you.
You live rural
Only one of four UK networks reaches your village. With Fuse, that’s the one you’re on — the best SIM for rural UK areas, because something always reaches you.
See all use casesYou commute
The tunnel under Old Street. The basement at work. The train through Watford. You stop watching messages buzz in batches when you finally come out.
See all use casesYou’re a student
Halls, campus, the bus into town, back at your parents’ for the weekend. £5.99 a month covers all of it — a flexible student SIM that follows you across the country.
Fuse for studentsYou travel for work
You stop hunting for a travel eSIM every time you land. Pulse and Surge include roaming, so the data you already have keeps working when you cross a border. Same number, same eSIM, no new app.
Fuse for travellersYou want a second SIM, just for data
Your work SIM stays put — calls, texts, your number. Fuse sits next to it as the data eSIM, on the same phone. Dual SIM in the UK, done cleanly.
Fuse for freelancersFAQ
Questions,
answered plainly.
What people ask before signing up.
About Fuse
What is Fuse Mobile?
Fuse Mobile is a UK multi-network data-only eSIM. It uses all four UK mobile networks — EE, Three, Vodafone, and O₂ — and connects your phone to whichever has the strongest signal, automatically.
Which UK networks does Fuse use?
All four: EE, Three, Vodafone, and O₂. Every plan includes access to every network. Your phone continuously measures signal across them and switches to whichever is strongest in your current location.
How is Fuse different from a normal eSIM?
A normal eSIM is locked to a single mobile network — whichever provider issued it. Fuse is a multi-network eSIM: it holds credentials for all four UK networks at once, so when one drops you, your phone moves to another automatically. No swapping, no waiting.
Compatibility
Which phones support Fuse?
Most modern phones from 2019 onwards. On iPhone, eSIM is supported from iPhone XS and newer. Most Android flagships (Pixel, Samsung Galaxy S and Note, etc.) from 2019+ also support eSIM. Check your phone’s Mobile or Cellular settings to confirm.
Can I use Fuse alongside my existing SIM?
Yes. Fuse is data-only and lives alongside your primary SIM, which keeps handling your calls and texts. Most modern phones support dual SIM — one physical SIM and one eSIM — which is exactly the setup Fuse is designed for.
Plans
How much does Fuse cost?
Three rolling-monthly plans: Spark at £5.99/mo (5 GB), Pulse at £9.99/mo (10 GB), and Surge at £14.99/mo (15 GB). All four UK networks are included on every plan. Pulse and Surge also include roaming.
Is there a contract?
No. All plans are rolling monthly. You can cancel any time from inside the Fuse app — no termination fee, no notice period.
What happens after the 7-day free trial?
If you don’t cancel, your trial converts to your chosen plan on day 8 and your card is charged for the first month. Your card is held during the trial so cancellation is clean, but isn’t charged unless the trial converts. You can cancel any time during the 7 days from inside the app.
Roaming
Does Fuse work abroad?
Pulse and Surge include roaming — you can use your data allowance in many countries at no extra cost. The Spark plan is UK-only. The full destination list and any country-specific notes live inside the Fuse app.
Account
How do I cancel?
Open the Fuse app, go to Plan, and tap “Cancel subscription”. No phone call, no email needed. If you cancel during the 7-day trial, your card is never charged.
Still have questions?
Visit the help centreBetter signal awaits
Try Fuse free.
For seven full days.
No contract. No credit check. Cancel any time before day seven and pay nothing.
No contract. Cancel anytime.