The process of updating WhatsApp has been revealing a number of new features regularly. This Facebook-owned messenger service with more than one billion users across the world has added these new features including call back and voice mailing facility.

These features will appear on the screen when a call is declined along with the other option to ‘Cancel’. Well, this doesn’t require your counter device to be updated to this WhatsApp for Android Beta version.

The new features appear on the app screen of a caller after a WhatsApp call has been declined or not picked at the other end. To get the feature you need to have signed up for Google Play beta testing program.

Both the Features, First is Call back, and Second is Voice Message, are extensions of the voice calling feature in WhatsApp.

To see how they work, you need to call a WhatsApp contact from the app, if the call is not picked or declined, your app screen will show a "call declined" message along with three options- Cancel, Call Back, and Voicemail.