As much as we would have loved to help all users in the world by adding features inside our app that allows integration with all other VoIP and messaging API's in the world, think about how non-beneficial that is to us
An app that combines all VoIP and messaging services should be developed neutrally, by an external developer, not Viber.
Currently, Viber's focus is on adding platforms, features and integrating with more platforms, as well as improving overall system performance. At the same time, we are working on additional premium services that will generate revenue once they become available. The basic Viber service - Viber to Viber phone calls and text messages - will ALWAYS be free.