Fuse Mobile

Fuse Mobile: a data-only eSIM that draws on all four UK networks

Fuse Mobile is a UK operator built around a single idea: instead of tying a customer to one mobile network, its eSIM holds credentials for EE, Three, Vodafone and O₂ at once. The phone continuously measures signal across the four and moves to whichever is strongest in the current location, without the user choosing or switching manually. The service is data-only, so it is designed to sit alongside a primary SIM that keeps handling calls and texts.

The company frames the product around the gaps in UK coverage. Citing Ofcom data, it states that 17% of the UK has no reliable 4G from any single network, and that each operator's weak spots fall in different places. Fuse's answer is to keep a backup network ready and slide the connection onto a stronger one when the current network weakens.

How the multi-network eSIM works

According to the company, a conventional eSIM is locked to the network that issued it, whereas Fuse holds credentials for all four UK networks simultaneously. When one drops the connection, the phone moves to another automatically. The site presents this as a background process the user does not have to manage.

Setup is handled entirely through the Fuse app, available for iPhone on the App Store and for Android on Google Play. The stated flow is: download the app, create an account with an email and password, choose a plan, and tap “Install eSIM” so the profile lands on the phone. The company says the account-creation step takes about 20 seconds and that no shop visit or posted SIM is involved.

Plans and pricing

Fuse offers three rolling-monthly plans, all of which include access to the four UK networks with automatic switching to the strongest signal:

• Spark — £5.99 per month, 5 GB, UK only.
• Pulse — £9.99 per month, 10 GB, with roaming in 120+ countries. Described as the most popular option.
• Surge — £14.99 per month, 15 GB, with roaming in 120+ countries, aimed at heavy use, streaming and hotspot.

There is no contract: plans are rolling monthly and can be cancelled from inside the app, with no termination fee or notice period. The company states there are no hidden fees and that users can switch between plans at any time without changing the eSIM.

Free trial and billing

Every plan includes a seven-day free trial. A card is held during the trial but not charged; if the customer does not cancel, the trial converts to the chosen plan on day eight and the card is charged for the first month. Cancellation during the seven days is done from the app and means the card is never charged. The company also states that the trial involves no credit check.

Roaming across 120+ countries

On Pulse and Surge, the monthly data allowance continues to work abroad at no extra cost, in more than 120 countries, without a separate travel eSIM or a second app. The site breaks the destinations down by region: 43 in Europe, 28 in the Americas, 16 in Asia Pacific and 29 in the Middle East and Africa, with countries such as Spain, France, the USA, Italy, Greece, Portugal, Canada, Australia, India and Turkey named as examples. The Spark plan is UK-only, and the full destination list and any country-specific notes are provided inside the app.

Coverage checking and device compatibility

Before signing up, prospective customers can enter a postcode to see Ofcom signal data for all four networks near a given address. On compatibility, the company states that most phones from 2019 onwards support eSIM: on iPhone from the XS and newer, and on most Android flagships such as Pixel and Samsung Galaxy S and Note models from 2019 onwards. It advises checking the phone's mobile or cellular settings to confirm. Because the service is data-only, it is intended for dual-SIM setups combining a physical SIM for calls and texts with the Fuse eSIM for data.

Who the service is aimed at

The company lists several user profiles: people living in rural areas where only one of the four networks reaches the village; commuters passing through tunnels, basements and stretches of railway with weak signal; students moving between halls, campus, town and home; travellers and people working remotely abroad; and freelancers or professionals who want a second, data-only line alongside their work SIM.