A few requirements for full functionality:
Viber for iPhoneiPhone 4 and later
iOS 7.0 and above
2.3.6 and above
Viber for Android
Windows Phone 8
Viber for Windows Phone
Minimum 512 MB RAM is required.
Delay in call notifications may occur. Issue resolution is in progress in cooperation with Microsoft.
Viber for Blackberry
Only full-touch devices running BlackBerry version 10.2.1 and later are supported
*Note: Blackberry store might disable some devices that do meet the above requirements.
(Viber for Desktop can be installed only after the most recent version of the application has been installed on a mobile device)
Viber for Desktop*
Windows: 7, 8, 10, XP SP3, Vista
Mac: OSX 10.7 and above
Linux: 64 bit, Ubuntu, Fedora
*Minimum hardware requirements:
CPU: Dual core processor
Memory: 1GB RAM, 1MB disk space
Microphone and speakers for voice calls and webcam for video calls
AD2P compatible Bluetooth receiver for BT devices