Push notifications so you don't miss a single message.Voice message history: check all the messages you've ever sent or received.Take part in public and private channels with space for up to 2,500 users.Check the availability of your contacts.Send messages in real time and with a high sound quality.Save money on your phone calls thanks to this walkie-talkie app for Android. The latter can be theme-based, therefore, we can find channels about movies, Christianism or any other kind of topic you may be interested in. Likewise, the application doesn't only limit you to your contact list as it also allows you to search for all the people that use the app and explore the different channels available from where we can send public messages. Once added, you'll be able to communicate with them by selecting them and recording voice messages by pressing the huge button in the middle of the interface. How it works is very simple as you only need to sign up as a user to be able to configure a profile and your contacts that use the application. And apps of the likes of Zello PTT Walkie Talkie take advantage of this protocol to turn our smartphone into a walkie-talkie. VoIP or Voice Over Internet Protocol is a technology that makes it possible to establish voice calls by simply using an Internet connection.