This is viber calling and message app.This application is very bad for social use. because of its quality. it is an dump app. its concept is very different and hard to use for some people.its design is too old and there is no any new thing in this application.its function and the look type is very old and it is not so useful application . this app is waste of our time.this application is not a useful app. because noone use this app. rather than other application. so it is not an useful app.