Viber for Windows Phone allows to make calls

Viber has received an update on Windows Phone adding several new features to take on the growing competition in the instant messenger market.

 See Also: Microsoft brings universal Windows apps

The update adds the ability to call any number, land line or non-Viber mobile using the app on Windows Phone at very competitive prices. Not only that, but the update also brings the ability to send out video messages (something that’s missing on WhatsApp) and multiple pictures at once. Lastly, the update adds the ability to transfer your calls to Bluetooth headset, thanks to the Bluetooth hands-free support.
You can pick version 4.1 of Viber for Windows Phone at this link for free, or can scan the QR core below.
 Source: apprtize