Viber is a cross-platform app for free messaging and VoIP on Android, iOS, Windows, Mac, and Linux. Owned by Rakuten Viber, it serves over 573 million users globally. Enjoy free text, voice, and video calls, end-to-end encrypted chats, and group communities. Viber Out offers low-cost calls to non-users. Sync across devices with a phone number.Viber official website