Zello is a push-to-talk app that allows event teams to communicate via smartphones and devices using WiFi or cell data. Here is our review.
Zello: What Is It?
Zello uses voice communication to relay messages in real time. It works via an app installed on a smartphone. Zello can be used instead of event radios as a live communication tool for teams. It allows completely private channels and group chat.
More information: https://www.eventmanagerblog.com/zello-app