So finally the much awaited WhatsApp free voice calling feature has been spotted in the latest builds of the android version of the app & seems to be closer to launch. This has been found on the version listed on their website. While Google Play features less up to date version of the app.
These features are being used for testing purposes & the screens seen in the latest build indicates the voice & the chat function separately, with different screens for dialing, logs & contacts.
CEO of the Facebook-owned WhatsApp, Jan Koum, in October confirmed that the voice calling feature was in the pipeline, but had revealed the release would be delayed till Q1 2015. He said that the company is still figuring certain bugs with the call feature. Moreover the development team is looking for ways to improve the call quality even in emerging markets which are still stuck around with 2G networks..