The feature is automatically enabled to all users updating to version 2.12.5 of WhatsApp via the Play Store, which brings a revamped user interface sporting three tabs: Calls, Chats and Contacts. Initiating a voice call is as easy as tapping the dialer icon that is available in-chat, or heading to the Calls tab and selecting a contact you wish to call. Both parties need to be on the latest version of the app for the voice calling feature to work.

The update is in the process of rolling out, so if you don't see it yet, just give it time. For users that have the voice calling option enabled, how are you liking the feature?