All 4 UK networks vs 2
Fuse data uses all four UK networks (EE, Vodafone, Three, O2). Three customers — even after the Vodafone merger — get access to two of the four. Fuse fills the gap with EE and O2.
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Fuse vs Three
Fuse Mobile and Three are both eSIM options in the UK. Following Three's merger with Vodafone, Three customers now use both networks via shared infrastructure — that's 2 of the 4 UK networks. Fuse uses all 4 (EE, Vodafone, Three, O2) and automatically picks the strongest signal. Here's the comparison — all Three facts verified from three.co.uk on 4 June 2026.
| Feature | Fuse | Three |
|---|---|---|
| Product | UK multi-network data-only eSIM | UK mobile network (now part of VodafoneThree) |
| UK networks | All 4 (EE, Vodafone, Three, O2) | Three + Vodafone (post-merger shared infrastructure) |
| Multi-network switching | ✓ — across all 4 UK networks | Across 2 (Three + Vodafone) |
| Data — apps you can use | Any app, any service. Standard unrestricted data. | Any app, any service. Standard unrestricted data. |
| Banking, social, streaming, VPN, gaming | ||
| Starting price | From £5.99/mo for 5GB | From £8/mo intro (120GB Lite, 24-month, reverts to £16/mo) |
| International roaming | 130+ countries on Pulse and Surge | Tiered: Europe 49 / Around World 22 / Extra 92 destinations. £2.75/day Europe, £8/day Around World |
| eSIM | ||
| Contract | Monthly rolling, cancel any time | 30-day, 12-month, 24-month, or PAYG |
Product
FuseUK multi-network data-only eSIM
ThreeUK mobile network (now part of VodafoneThree)
UK networks
FuseAll 4 (EE, Vodafone, Three, O2)
ThreeThree + Vodafone (post-merger shared infrastructure)
Multi-network switching
Fuse✓ — across all 4 UK networks
ThreeAcross 2 (Three + Vodafone)
Data — apps you can use
FuseAny app, any service. Standard unrestricted data.
ThreeAny app, any service. Standard unrestricted data.
Banking, social, streaming, VPN, gaming
Fuse
Three
Starting price
FuseFrom £5.99/mo for 5GB
ThreeFrom £8/mo intro (120GB Lite, 24-month, reverts to £16/mo)
International roaming
Fuse130+ countries on Pulse and Surge
ThreeTiered: Europe 49 / Around World 22 / Extra 92 destinations. £2.75/day Europe, £8/day Around World
eSIM
Fuse
Three
Contract
FuseMonthly rolling, cancel any time
Three30-day, 12-month, 24-month, or PAYG
Three data in the table above was verified from Three's own published pages on 4 June 2026. Pricing and promotional terms change frequently — please re-check Three's website for current details before deciding.
Sources: SIM-only plans·VodafoneThree merger·Go Roam (roaming)·eSIM support
Why Fuse
What Fuse offers.
Strongest signal wins
Fuse scans all four networks continuously and moves to whichever is strongest in under a second. Three+Vodafone's shared infrastructure helps coverage but only across two carriers.
No EE or O2 dead zones
Areas where EE or O2 have stronger coverage than Three/Vodafone — your data goes weak on a Three plan. On Fuse, you switch to the stronger network automatically.
Roaming included, not £/day
Fuse Pulse and Surge plans include data in 130+ countries. Three charges a daily fee for Go Roam (£2.75/day Europe or £8/day Around the World, per the rates published 18 Dec 2025).
Fuse is a UK multi-network data-only eSIM — one digital SIM that uses all four UK networks (EE, Three, Vodafone, O2) and switches automatically to whichever has the strongest signal. Fuse does not issue a phone number; Three does. Most customers keep Three for calls and SMS on their existing number, and add Fuse alongside via dual-SIM to handle data.
Yes. Every eSIM-capable phone (most flagships from 2018 onwards) supports dual-SIM — one physical SIM and one eSIM, or two eSIMs. Keep Three for calls and SMS, install Fuse as a second eSIM for data. Both lines work at the same time.
No. Fuse is data-only — there is no number, no carrier voice calls, no SMS. Apps like WhatsApp, FaceTime, iMessage and Signal work normally over the Fuse data line. Your existing Three number stays where it is.
No — Fuse is rolling monthly. Cancel or change plan any month with no exit fees. Plans start at £5.99/month for Spark (5GB), £9.99 for Pulse (10GB plus roaming in 130+ countries), and £14.99 for Surge (15GB plus roaming).
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