A few requirements for full functionality:
iOS 6.0 and above
2.3.6 and above
S40, S60, Symbian
Supports free messaging service only.
Stickers and emoticons are not available.
To find out if your device is supported, please check the Nokia Store
7 and 8
Minimum 512 MB RAM is required.
WP 7.x devices do not support stickers and emoticons.
Delay in call notifications may occur. Issue resolution is in progress in cooperation with Microsoft.
OS5, OS6, OS7
OS6 devices support free messaging service only, except in CDMA devices.
Only full-touch devices running BlackBerry version 10.2.1 are supported
Desktop* (Viber for Desktop can be installed only after the most recent version of the application has been installed on a mobile device)
Windows: 7, 8, XP SP3, Vista
Mac: OSX 10.7 and above
Linux: 64 bit
*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