The Ziber mobile application is easy to download to your smartphone (from Android and iOS) and redirects VOIP calls from mobile phones, Internet applications and other devices to the main blockchain system.
Most mobile operators have different subscriptions including free calls within the same mobile network or within your city.
The Ziber client on a mobile phone allows other people call using the phone as a proxy server for routing.
This call is completely free. There is no need to pay even $0.000001 to a mobile provide