Joining a channel from the directory comes with a set of unspoken rules known as "Radio Etiquette":

Constantly streaming audio drains battery. If you are in a very active channel and don't need to hear every word, use the "Speaker Off" feature or leave the channel to save power.

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Because Zello’s native search can be limited, the community has built its own resources. As of 2025, the most reliable external directories include:

Warning: Avoid sketchy "private directory" services that charge a fee. Zello channels are free to join. Anyone selling access is likely a scam.