Wi-Fi Calling — technically Voice over Wi-Fi (VoWiFi) — lets your phone route normal voice calls and SMS through a Wi-Fi network instead of the mobile network. The other person dials your normal number — they don't know or care that you're on Wi-Fi.
When it helps
- Basement, thick walls, rural homes: no cellular signal but Wi-Fi works
- Travel: hotel Wi-Fi lets you receive UK calls abroad without roaming charges
- Underground / metro stations: where free Wi-Fi exists
How to enable
Settings → Phone → Wi-Fi Calling (iOS) or Settings → Connections → Wi-Fi Calling (Samsung). Toggle on.
Compatibility
Supported on all four UK networks. Most modern phones (iPhone 6+, Galaxy S6+) support it. Some MVNOs disable it — check before relying on it.
See also
How Wi-Fi Calling (VoWiFi) matters when picking a UK mobile plan
Understanding Wi-Fi Calling (VoWiFi) 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 Wi-Fi Calling (VoWiFi) 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.