Why we
built Fuse.
The UK has four mobile networks. Almost every other provider — giffgaff, VOXI, SMARTY, Tesco Mobile, BT Mobile — sits on top of just one. We thought there should be one that uses all four.
The problem we kept hitting
Every UK mobile customer eventually learns the same lesson: no single network has good coverage everywhere. Your friend on EE has full bars in places you don’t. Your phone is great at home but useless at your parents’. Your office is a dead spot on Vodafone but fine on Three.
The networks publish “99% coverage” claims. They’re technically accurate — 99% of the UK population can find some spot on that network’s map. But that’s not how mobile actually feels. What you experience is a patchwork: rooms in your house with no signal, a corner of the train where calls drop, the weekend at the in-laws’ where you might as well be off-grid.
The standard answer the industry sells you is “switch networks”. So you go through the whole song and dance, switch from O2 to EE, and discover EE has a different set of dead spots. You haven’t solved the problem. You’ve just rotated it.
You haven't solved the problem. You've just rotated it.
On switching networks· the old way
What changed
Two things made multi-network actually viable in 2025-2026 that weren’t there before:
- eSIM became mainstream. Every iPhone from 2018 onwards, every Samsung flagship from 2020 onwards, almost every Android premium device today — all support eSIM. We can provision profiles for multiple networks onto one chip without asking customers to swap physical cards.
- UK 3G shutdown forced network upgrades. As EE, Vodafone, Three and O2 retired 3G during 2024-2025, their underlying agreements with MVNOs were renegotiated. The terms finally allowed building a SIM that can talk to all of them.
So we did. Fuse is a multi-network eSIM that connects to EE, Three, Vodafone and O2 through a single profile, and switches automatically to whichever has the strongest signal where you are. No setting to change, no manual network selection, no fuss. Read the technical detail in the multi-network eSIM guide.
The four decisions we made up front
Things we decided early that shaped everything else.
Data-only, on purpose
In 2026 almost nobody pays for SMS or voice minutes. People call on WhatsApp, FaceTime, Google Meet, Teams. We don't sell voice or text bundles because they're a tax on a service you're not really using. Fuse is data-only by design — if you need a number for SMS verification or a workplace mobile, run Fuse alongside another SIM (every modern phone supports it).
No contracts, full stop
The big networks lock you into 24 or 36 months because their economics depend on the lock-in. Ours don't. You pay monthly, you leave any month, no exit fee. That puts pressure on us to keep being worth the next month's payment — and we'd rather have that pressure than your signature.
The price you see is the price you pay
No activation fees, no admin charges, no automatic annual price hikes baked into year two. The UK mobile industry has trained customers to expect hidden costs everywhere. We picked one price for each plan and that's it — see /no-hidden-fees for the explicit list of things we don't charge for.
Open about how it works
We publish what we do. Multi-network is explained at /multi-network-esim. Coverage data is real Ofcom signal data, not a hand-drawn map. The glossary at /glossary explains the jargon other carriers hide behind. If the tech is ever a black box, it's because we haven't written it up yet — not because we don't want you to know.
Where we are now
Fuse Mobile is pre-launch as of 2026. The product is built, the eSIM provisioning is live, coverage data is feeding from Ofcom, roaming is wired across 130+ countries. We’re finishing the last details before going public — payment edge cases, onboarding polish, the kind of thing that’s invisible when it works and infuriating when it doesn’t.
We’re not racing to launch. The mobile industry is full of providers that hit Send too early and spent the next two years apologising. We’d rather take the extra month, hit the ground at full speed, and have you tell your friends because it actually worked.
If you want to be first in when Fuse goes live, the plans page is the place to start, and you can contact us with any questions.
That’s the story
One eSIM. All four UK networks. No contract. £5.99 to start.