WhatsApp has rolled out the fingerprint lock in its recent update, only you need to update your WhatsApp from play store to use this great feature. This will add an extra layer of security to your WhatsApp which secures your chats. In android, you can use only fingerprint sensors while in iOS you can use both fingerprint and face id to unlock your WhatsApp. Step 1: Open WhatsApp and tap on three dots. Step 2: Go to Setting>Account>Privacy>Fingerprint Lock. Step 3: Turn on the Fingerprint Lock to enable the lock on your WhatsApp. Step 4: Touch your fingerprint sensor when prompted to verify the fingerprint. Step 5: Select the automatic lock time interval from Immediately, After 1 minute, After 30 minutes.