WhatsApp for Windows Phone adds voice calls
The app has been updated to add this feature. Now, according to the WhatsApp Windows Store page, you can “call your friends and family using WhatsApp for free, even if they’re in another country.”
Voice calling has been available for quite a while, but Windows Phone is finally catching up. It was available to Android and iOS users earlier this year, and BlackBerry owners have been able to call contacts through the app since April.