In start of this year WhatsApp told that he will add voice-calling feature in now you can see leaked pictures of voice-calling feature interface which are given by Androidworld.nl online.
The WhatsApp app has two versions for Android devices: one which is available on PlayStore and second which you can get from WhatsApp’s website. The Playstore’s version is stable version means it gets update when the company issue full version update but the version available on company’s website is updated more frequently and has a lot of hidden features. The latest version on the company website had a lot of hidden secret screens that were unearthed. These screenshots point to a voice calling functionality which will most likely be seen on WhatsApp sooner rather than later.
It is unconfirmed from company but according to the screenshots this new feature contains calling and chatting pages separately and Call logs, dialling and contacts screen are also shown on separate screens. Another interesting feature includes call recording and playback.