Similar to LastPass, 1Password, and other apps, once you enable Screen Lock on WhatsApp, you will have to confirm your identity using Face ID/Touch ID every time you open WhatsApp.
The new feature appears to be an attempt from WhatsApp to make the software more secure overall.
A feature which has been much awaited by iPhone users for a very long time has now arrived in WhatsApp.
If you were anxious about others accessing your WhatsApp activity, especially on devices that you might share with children or friends, then all you have to do to secure those chats is to update the WhatsApp to the newest version.
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WhatsApp has updated its iOS app to add a Screen Lock feature. To access the new settings, you'll have to go to Settings, then Account, followed by Privacy.
WhatsApp for iOS added over the weekend the ability to lock and hide your chats instantly with your face or fingerprint.
They can be used to lock the app itself, not individual conversations. WhatsApp for Android is also in the rumours to bring a similar form of authentication layer in the coming future.