Many channels are set to "Unlisted" (not searchable in the app) to avoid trolls. To find these, you must know the exact name. Websites catalog these channels.
is a push-to-talk (PTT) app that turns smartphones, tablets, and computers into digital walkie-talkies. A Kanal (German for channel ) is a public or private live audio stream where multiple users can communicate in real time. zello kanäle