After launching it first on Android and the later bringing it to iOS, WhatsApp has finally brought over its voice calling feature to the Windows Phone version. You can now finally call your buddies using Android or iOS devices on WhatsApp, instead of Viber, or Skype, or any of the other dozen services.
Along with voice calling, the update also brings with it the ability to send voice notes, which is only available on devices running 8.1 and above. Other than that there is not much else new in this update.
You can download it from the link below or update it through the store app on your phone.