After the success of Instagram's All In Black theme,Facebook has egarly launched the same theme on the famous chat app WhatsApp.Let's enable it. Android 1) Make sure you have updated version of WhatsApp. In Android go to WhatsApp app.Tap on the 3 dots at top-right. 2)Click on settings . 3)Go to chat . 4)Go to themes and select the dark option. That's it. iOS Make sure you have iOS 11 or above and had downloaded the latest version of WhatsApp. 1)Go to settings of iOS . 2)Go to display and brightness. 3)Select Apperence as dark and the appication will be themed dark. That is all folks.