How does a walkie talkie app like Zello work?

Episode 1610 (15:22)

Bill from Wilmington, CA
Zello

Bill wants to know about the Zello walkie talkie app. How does it really work? Does it transmit over the air like a real walkie talkie? Leo says it doesn't broadcast, it uses your mobile phone data network to communicate. So you use data every time you use Zello. It's similar to VoIP in that regard. It's fun and handy, but it does eat through your data.