Free Video Calling feature will allow you to make video calls to your friends and family anywhere in the world for free as long as you have a Wi-Fi network or effective data plan on your registered number. German technology blog Macerkopf.de has posted what it claims are screenshots from an unreleased version of WhatsApp for iOS. At present it is not clear whether or not the leaked screenshots are legitimate, but if they are genuine, WhatsApp could take an enormous bite out of some of its top rivals.
Source: https://thehackernews.com/2015/12/activate-whatsapp-video-calling.html