Fuse and FlexiFone are close rivals: both are UK multi-network products that use all four networks — EE, Three, Vodafone and O2 — and switch automatically to the strongest signal. Fuse is a pure data-only eSIM with a 7-day free trial and roaming in 120+ countries. FlexiFone offers a broader range including physical SIMs and voice plans. Here's a fair, side-by-side comparison — every FlexiFone fact verified from their site on 25 July 2026.
| Feature | Fuse | FlexiFone |
|---|---|---|
| Product | UK multi-network data-only eSIM | UK multi-network SIM (eSIM or physical; data-only or voice+data) |
| UK networks | All 4 (EE, Three, Vodafone, O2) | All 4 (EE, O2, Vodafone, Three) |
| Automatic network switching | ||
| SIM format | eSIM only | eSIM or physical SIM (physical £3.50, per their site) |
| Voice & SMS | Data-only — no phone number | Data-only or voice+data plans available |
| Starting price (rolling, no commitment) | From £5.99/mo (5GB, Spark) | 5GB data-only £8/mo (as of 25 Jul 2026) |
| Cheapest headline rate | From £5.99/mo, rolling | 5GB £45/year = £3.75/mo (annual prepay, per their site) |
| International roaming | 120+ countries on Pulse & Surge | Free roaming in 75+ destinations (per their site) |
| Contract | Monthly rolling, cancel any time | 30-day rolling, or annual (locked until the term ends) |
| Free trial | 7-day free trial | Not stated |
Product
UK networks
Automatic network switching
SIM format
Voice & SMS
Starting price (rolling, no commitment)
Cheapest headline rate
International roaming
Contract
Free trial
FlexiFone data in the table above was verified from FlexiFone's own published pages on 25 July 2026. Pricing and promotional terms change frequently — please re-check FlexiFone's website for current details before deciding.
Why Fuse
On a no-commitment rolling plan, Fuse's 5GB Spark is £5.99/month. FlexiFone's cheapest 5GB rolling data-only plan is £8/month (as of 25 July 2026) — their £3.75/month rate needs a 12-month annual prepay. If you don't want to lock into a year, Fuse is the lower rolling price.
Both include roaming, but Fuse includes data in 120+ countries on Pulse and Surge. FlexiFone states free roaming in 75+ destinations. If you travel widely, Fuse covers more of the map.
Fuse gives you a 7-day free trial, so you can test multi-network coverage where you live and work before you pay. FlexiFone doesn't state a free trial on its site.
Fuse does one thing: a simple, unrestricted data-only eSIM that uses all four UK networks. FlexiFone offers a broader range (physical SIMs and voice+data plans too) — if you specifically want calls and texts on the same SIM, that flexibility is worth noting. For a pure data line, Fuse keeps it simple.
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