Video calls on mobile: Now you can video-call anyone from your phone!.Let’s take a closer look at the awesome features in Viber for Windows 10: Share photos, videos and voice messages, message groups of up to 200 people, and if you have second thoughts about a message you’ve sent, just delete it – even after it’s been delivered. Viber is the easy-to-use free app that lets you send messages and make HD-quality phone and video calls securely over WiFi and mobile networks from just about anywhere.