To understand why the is so effective, we have to break it down acoustically. Most ringtones are melodic. They are designed to be pleasant background noise until you answer the phone. The police walkie-talkie sound, however, is utilitarian.

There is a sociological aspect to this trend as well. In an increasingly digital and isolated world, the sound of a radio implies connection. It suggests you are part of a team, a unit, or a network.

The Ultimate Guide to the Police Ringtone Walkie Talkie: Sounds, Style, and Setup