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Three Coverage Checker

Check official Three signal strength. Enter your postcode to see combined 4G and 5G coverage, indoors and outdoors.

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Data provided by Ofcom • Updated regularly

Three (also known as 3) is one of the UK's four major network operators. Known for competitive data allowances and straightforward pricing, Three provides coverage to its own customers and MVNOs like SMARTY and Superdrug Mobile.

About Three Coverage

Three entered the UK market in 2003 as a 3G-only network and has grown to become one of the four major operators. Their 4G network covers around 99% of the UK population outdoors, though coverage in rural areas can be patchier than some competitors.

Three is known for offering generous data allowances and was one of the first networks to widely offer unlimited data plans. They also include Go Roam destinations where you can use your plan abroad at no extra cost.

Indoor coverage can be more variable with Three compared to some rivals, particularly in buildings with thick walls. However, Three supports WiFi calling on compatible handsets which can help if your indoor signal is weak.

Three has been investing heavily in 5G and holds significant 5G spectrum. Their 5G rollout is ongoing across major UK cities. In 2023, Three and Vodafone announced a planned merger which could significantly reshape the UK mobile landscape.

Three Coverage FAQ

Three's rural coverage has improved significantly but can still be patchier than EE in some areas. Check your specific postcode above to see Three's signal strength in your location.
SMARTY and Superdrug Mobile operate as MVNOs on Three's network. They share the same masts and coverage, so signal strength is identical.
Indoor coverage varies by location and building type. Three supports WiFi calling on most modern smartphones, which lets you make calls over your broadband connection when mobile signal is weak.
Three and Vodafone announced a planned merger. If approved, the combined network would create the UK's largest mobile operator by customer numbers, which could affect future coverage.