Linda Wertheimer talks to Patrick Tucker, the technology editor for Defense One, about Zello — a walkie-talkie app. That app is becoming a key tool for protesters in Ukraine and Venezuela.

The smartphone app Zello shot to the top of the Android and iPhone trending lists this week as thousands of people downloaded it in preparation for Hurricane Florence. But what is Zello ...

Zello, a walkie-talkie app where users can push a button to talk to any one through a cellular or Wi-Fi connection, is the most popular free app on both Android and iOS app stores. According to ...

Called Zello, the app lets you use your phone as a walkie-talkie or two-way radio as long as you have a network or WiFi connection. Users can join channels and instantly send voice messages or ...