Great news for WhatsApp users on Windows Phone!! The app has been updated to version 2.12.6 and the update brings much-awaited VOIP calls and audio file sharing to Windows Phone. You may need to uninstall and reinstall the app, so take a backup first.
• WhatsApp Calling: Call your friends and family using WhatsApp for free, even if they’re in another country. WhatsApp calls use your phone’s Internet connection rather than your cellular plan’s voice minutes. Data charges may apply. Available on Windows Phone 8+.
• You can now send audio files (available on Windows Phone 8.1+).