A coverage map is a network's published map of where it has signal. UK networks publish them voluntarily; Ofcom also publishes an aggregated map showing all four UK networks side by side.
What to look for
- Coverage by technology: 4G and 5G layers separately
- Indoor vs outdoor: indoor coverage is always weaker due to walls
- Postcode-level resolution: avoid maps that only show city-level data
- Predicted vs measured: most operator maps are predicted from RF models, not measured from real devices
Why one map isn't enough
Each network's own map shows only that network. To get a complete picture, you need to check all four — or use Ofcom's combined map. Fuse's coverage checker pulls live Ofcom data so you see all four networks at once for any UK postcode.