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Fuse
Multi-network eSIM

One eSIM.Every UK network.

Fuse connects your phone to EE, Three, Vodafone and O2 through a single digital SIM. Your device picks the strongest signal automatically — no app throttling, no restrictions, no contracts.

See plansHow it works
How it works

Set up in under 60 seconds.

No waiting for a SIM in the post. No shop visit. Three steps, scan once, you're on four networks.

Scan a QR code

We email you a QR after signup. Open your phone's camera, scan, follow the prompts. That's the install done.

Pick your plan

Spark, Pulse or Surge. From £5.99/mo. All include all four networks.

Strongest signal wins

Phone auto-switches. No setup, no thinking.

No SIM in the post

eSIM is digital. You can be live within the hour.

130+ countries

Roaming included on Pulse and Surge.

No contract

30-day rolling. Cancel any time.

Four networks. One eSIM.

Every UK network has different strengths. Fuse uses all four — so your phone always has the best one available. It's a true multi-network eSIM: one digital SIM across EE, Three, Vodafone and O2.

EE

EE

UK's largest 4G network and a leader in 5G rollout. Covers 99% of the UK population with 4G and offers the fastest average download speeds in most independent tests.

3

Three

Known for generous data allowances and strong 5G coverage in urban centres. Three excels in cities and towns, and their mid-band 5G spectrum delivers reliable high-speed connections.

V

Vodafone

Vodafone offers dependable nationwide coverage with particularly strong signal in rural areas where other networks often struggle.

O₂

O₂

O2 is one of the UK's most trusted networks with a growing 5G footprint and excellent indoor coverage. Their 4G network covers over 99% of the UK outdoor population.

Networks available

FuseEE, Three, Vodafone, O2
Single-network SIM1 network only

Auto-switching for best signal

Fuse
Single-network SIM

Dead-spot protection

Fuse
Single-network SIM

International roaming

Fuse130+ countries
Single-network SIMVaries

5G access

FuseAll four networks
Single-network SIMOne network only

Contract required

Fuse
Single-network SIM

App restrictions

Fuse
Single-network SIM

Travel-ready

Works in 130+ countries.

Your Fuse eSIM travels with you. Land at your destination — phone connects to a local partner network automatically. No local SIM, no surprise roaming bills.

See roaming countries
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A multi-network eSIM is a digital SIM that connects your phone to more than one mobile network. Instead of being locked to EE, Three, Vodafone, or O2 individually, it registers your device across all four operators simultaneously. Your phone then automatically selects whichever network has the strongest signal at your location.
Fuse uses multi-network eSIM technology to register your device across EE, Three, Vodafone, and O2 simultaneously. Your phone automatically selects the network with the strongest signal at your current location. Handover is seamless — no interruption to browsing, streaming, or calls.
Most smartphones released from 2018 onwards support eSIM technology. This includes iPhone XS and newer, Samsung Galaxy S20 and newer, Google Pixel 3 and newer, and many other Android devices. You can check your specific phone on our How It Works page.
Most customers are fully connected within five minutes. After choosing your plan and completing sign-up, you receive a QR code by email. Scan it with your phone camera, follow the on-screen prompts, and your eSIM activates instantly.
No. Fuse is a data-only eSIM — there is no phone number, no carrier voice calls, no SMS. Your existing SIM keeps your current number for calls and texts; Fuse runs alongside it via dual-SIM and handles data. Apps like WhatsApp, FaceTime and iMessage work normally over the Fuse data line.
No. Every Fuse plan is rolling monthly with no minimum term. You can change your plan, pause your service, or cancel at any time from your account dashboard. There are no exit fees, no early termination charges, and no penalties for leaving.
When you reach your data limit, your service will not cut off abruptly. We will notify you before you reach your allowance so you can decide what to do. You can upgrade your plan instantly, purchase a data bolt-on, or wait until your next billing cycle. We do not charge surprise overage fees.
Yes. Most modern smartphones support dual SIM, which means you can use one physical SIM and one eSIM at the same time. Keep your existing provider in the physical SIM for calls and texts, and use Fuse in the eSIM slot for data.

More on eSIM

Better signal awaits

Ready to fuse
your networks?

Sign up in 90 seconds. Scan one QR code. Get four networks — for the price of one.

Try free for 7 daysSee plans

No contract. Cancel anytime.