If you get a call via Whatapp, don’t be surprise. This just means you also have the Whatsapp calling feature now.
How to Get this Feature
Update your Android smartphone with the latest version of WhatsApp Google Play. And ask one of your friends who already have the calling feature to call you and there you go. Now you can see your Whatsapp interface has three tabs i.e. calls, contacts and chats.
The feature is soon to arrive on iOS in the upcoming weeks, said WhatsApp co-founder Brian Acton at Facebook’s recent F8 conference.