WhatsApp's Messenger most awaited features, fingerprint authentication, is finally rolling out to Android users. The feature is currently available to those who have registered in WhatsApp's beta programme for Android. The Fingerprint authentication has been around on the platform since last year to iOS users. This is the first time the feature has made its way to a stable WhatsApp beta build for Android. The beta tester for WhatsApp, you can activate the functionality by tapping on the hamburger menu (three dots on the top right corner). To select Settings>Account>Privacy>Fingerprint lock. You can then select how frequently you want WhatsApp to prompt you to use your biometrics to unlock the app.WhatsApp users would only be able to unlock WhatsApp and resume the app from where they left it.