Discover an area's mobile network coverage and current mobile network issues for Three
Three Mobile Coverage Checker and Issues
https://www.three.co.uk/Discover/Network/Coverage
WiFi Calling
Ensure you have WiFi Calling enabled for making and receiving calls where there is bad coverage.
See: How do I enable WiFi Calling on an iPhone?
Support for Mobile Network
- If the IT Team are absent and you need urgent assistance with the phone network, specifically at weekends, bank holidays or during the Christmas holidays, call Three on 0800 033 8033.