This app is mentioned @Jane72 in the guides already provided to you ; it is actually quite useful :-
My Network App - Find Out More About Your Network Coverage | Apps | O2
https://www.o2.co.uk/apps/my-network
Understand your network coverage
With the My Network app you can keep an eye on your coverage, wherever you are. Download the app and you’ll be able to:
- check the status of our network in your area – you don’t even need to enter your postcode
- test your network speeds
- report any issues with your service.
It’s simple to use and means that you can check the network without having to visit the main site or even enter a postcode.
