It looks like popular walkie-talkie app Voxer is about to get some competition in the mobile voice chat space. A new app called Zello is growing like crazy, too – in fact, it’s growing faster than ...

More than 1 million people downloaded walkie-talkie app Zello in just a day as Hurricane Irma hit the Caribbean, and it's now topped Apple's app store chart in the U.S. People are using it to talk to ...