When idle, the Zello app consumes 20 kB (kilobytes) per hour when idle. When talking, it will use between 12 and 45 kB/s (kilobytes per second) depending on the connection type.

The audio encoder is chosen based on the connection type of both the sender and receiver. If both are using WiFi, it will use 45 kB/s. If either one is using cellular, it will switch to 12 kB/s.

Average monthly data usage generally ranges from 70-100 MB, although individual usage may vary.