An MVNO (Mobile Virtual Network Operator) is a phone provider that doesn't own the underlying network — it leases capacity from one of the big networks and sells service under its own brand.
UK examples
- giffgaff runs on O2
- VOXI runs on Vodafone
- SMARTY runs on Three
- iD Mobile runs on Three
- Tesco Mobile runs on O2
- BT Mobile runs on EE
These are all single-network MVNOs — your coverage is whatever the host network gives you.
Multi-network MVNOs
A small number of MVNOs (Fuse included) run across multiple networks. Your eSIM holds profiles for several networks and switches between them automatically based on signal strength.
See also
How MVNO matters when picking a UK mobile plan
Understanding MVNO helps you compare mobile providers on a like-for-like basis. Most consumer mobile pricing pages skip the technical detail — knowing the terminology means you can spot when a plan is genuinely better and when it just sounds that way. The Fuse Mobile glossary keeps definitions short and consumer-focused, no jargon-on-jargon.
Fuse Mobile is a UK multi-network data-only eSIM — it gives your phone access to all four UK mobile networks (EE, Three, Vodafone, O2) through a single profile. Where MVNO is relevant to that setup, it's surfaced explicitly: pricing pages show real numbers, the coverage checker shows live per-network signal, and there's no hidden fee structure. See the plans page for the current pricing or read the multi-network eSIM explainer for the technical detail.