viber out

Viber's main source of revenue is selling Viber Out stickers and services
during a visit to the company's headquarters in vietnam, mr. talmon marco, viber's ceo, shared that vietnam is one of its strategic markets.
Viber launches Viber Out, allowing calls to any fixed and mobile number
today, the free messaging and calling service on viber smartphones introduced a new feature called viber out. this feature allows users to make calls from viber to any fixed or mobile phone number not registered to use viber.