Besides the fact that you can make real time calls, the application will allow you to leave audio messages to any of your contacts and receive them when they can. This way you can use Zello as a messenger for leaving notes to your friends or even to yourself.
The application in any case,will show you a list of available contacts that are online, so you can establish a line of connection with them at any moment.
Zello Walkie Talkie is a very useful tool that any user can be able to use to communicate without having to spend any money. Also, it offers a fast and simple solution for leaving audio message to any of your friends.