WhatsApp CEO, Jan Koum, in October had said the voice calling feature in WhatsApp was in the making and if latest reports are to be believed it will be a reality soon. According to AndroidWorld.nl which has got hold of screenshots of WhatsApps rumoured voice calling feature , voice functionality may be announced soon.
The site further adds WhatsApp is distributed through its website and Google Play store for Android devices.
The web version is updated frequently and often contains hidden features that the company plans on adding to app. It is this version that has revealed the voice calling functionality features has been found.