Viber is a proprietary cross-platform instant messaging voice-over-Internet Protocol application for smartphones developed by Viber Media. In addition to text messaging, users can exchange images, video and audio media messages. The client software is available for Android, BlackBerry OS, iOS, Series 40, Symbian, Bada and Windows Phone. Viber works on both 3G and WiFi networks. Viber reached 175 million users as of February 26, 2013.