Waze also for me. Long journeys i listen to music via Spotify via Bluetooth to car speakers. But waze is running in backround and if there is a alert(like a speed camera, police etc) it will for a brief second override the music and alert you.
In Estonia at least there are heavy fines + confiscation of radar/laser detector as police have also radar detector detectors. In reality two feasible detectors that can be used without police knowing about it were beltronics sti magnum and one more(i cant remember the name atm) that have no radar leakage and are basically immune to detection equipment.