Viber is a free instant messaging and (VoIP) Voice over IP service application software developed and published by Viber media. This messaging app was released on December 2, 2010, in the direct competition of Skype, but as it was only for iOS, so its initial version was not that much praised. Later as it was released on various platforms for both mobile and desktop, its subscriber’s entity increases and new upgraded features of the app started attracting the users from all over the world. It is the only instant messaging app that is available for all the famous platforms either of mobile or desktop. According to the stats of February 2014, it was stated that this app has more than 100 million worldwide active users and have more than 280 million globally registered users. The straightforward and easy user interface of the app makes it one of the quickest and convenient messaging app present currently in the market. It is available for Windows, Mac OS, Android, BlackBerry OS, iOS, Series 40, Symbian, Bada, Windows Phone, Linux (Ubuntu, Debian, Fedora, openSUSE).