All 4 UK networks vs one
Fuse data uses all four UK networks (EE, Vodafone, Three, O2) automatically. Sky Mobile is an O2 MVNO — your coverage depends entirely on O2 wherever you are.
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Fuse vs Sky Mobile
Fuse Mobile and Sky Mobile are both eSIM options in the UK. Sky Mobile is an O2 MVNO with 12-month minimum contracts and a data-rollover feature (Sky Piggybank). Fuse is a UK multi-network data-only eSIM that uses all four UK networks and is monthly rolling. Here's the comparison — all Sky Mobile facts verified from sky.com/mobile on 4 June 2026.
| Feature | Fuse | Sky Mobile |
|---|---|---|
| Product | UK multi-network data-only eSIM | UK mobile service on O2 (MVNO) |
| UK networks | All 4 (EE, Vodafone, Three, O2) | O2 only |
| Multi-network switching | ||
| 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 £1/mo for 1GB (12-month) |
| International roaming | 130+ countries on Pulse and Surge | Roaming Passport Plus: 120 destinations, £2/day, 25GB cap |
| eSIM | ||
| Contract | Monthly rolling, cancel any time | 12-month minimum (credit check applies) |
Product
FuseUK multi-network data-only eSIM
Sky MobileUK mobile service on O2 (MVNO)
UK networks
FuseAll 4 (EE, Vodafone, Three, O2)
Sky MobileO2 only
Multi-network switching
Fuse
Sky Mobile
Data — apps you can use
FuseAny app, any service. Standard unrestricted data.
Sky MobileAny app, any service. Standard unrestricted data.
Banking, social, streaming, VPN, gaming
Fuse
Sky Mobile
Starting price
FuseFrom £5.99/mo for 5GB
Sky MobileFrom £1/mo for 1GB (12-month)
International roaming
Fuse130+ countries on Pulse and Surge
Sky MobileRoaming Passport Plus: 120 destinations, £2/day, 25GB cap
eSIM
Fuse
Sky Mobile
Contract
FuseMonthly rolling, cancel any time
Sky Mobile12-month minimum (credit check applies)
Sky Mobile data in the table above was verified from Sky Mobile's own published pages on 4 June 2026. Pricing and promotional terms change frequently — please re-check Sky Mobile's website for current details before deciding.
Sources: SIM-only plans·Roaming Passport Plus·Sky Piggybank (data rollover)
Why Fuse
What Fuse offers.
Strongest signal wins
Fuse scans all four networks continuously and moves to whichever is strongest in under a second. Sky stays on O2 — if O2 is weak in your area, your data stays weak.
Monthly rolling, no 12-month lock-in
Fuse is monthly rolling — cancel any time. Sky Mobile's SIM-only plans carry a 12-month minimum term with a credit check. Sky's data-rollover ("Sky Piggybank") is genuinely nice but the contract is fixed.
Roaming included, not £/day
Fuse Pulse and Surge plans include data in 130+ countries. Sky's Roaming Passport Plus covers 120 destinations at £2/day with a 25GB cap — comparable reach, different cost model.
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; Sky Mobile does. Most customers keep Sky Mobile 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 Sky Mobile 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 Sky Mobile 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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