In the UK we cant listen into radio communications, we can still identify it using the same techniques that is used to work out encrypted internet communication, namely the traffic patterns of the radio devices.

In more than 100 countries, Tetra (Trans European Trunked Radio) is used.

This was published a couple of months ago.

https://www.tetraburst.com/

https://github.com/MidnightBlueLabs/TETRA_burst

http://rageuniversity.com/PRISONESCAPE/JAMMING%20RADIO%20GSM...