Zello

Jewelo is a free application that lets you send voice messages, as if sent from a wax table. You can contact both of your PCs and those who have installed applications on their iOS or Android devices

As well as being able to communicate with your contacts directly, you can leave a voice mail when you are available.

Users can also create open frequencies. Everyone can connect with them, but you need to add people as a contact so they can talk.

Zello is an application that lets you communicate with your friends on a free basis. In addition, thanks to this version, you will not even need a smartphone to be able to communicate with them.