WhatsApp has offered an update for its iOS app in order to add a Screen Lock feature. The app leverages the Touch ID or Face ID feature on your phone in order to lock the app.
If you wish to enable the feature, simply go to Settings > Account > Privacy and then enable Screen Lock. As determined by your phone, you are either able to use the fresh Face ID method or the old Touch ID.
This thing basically locks whole of the app at the back your authentication system, therefore, now just those people who are authorized to unlock the phone are able to unlock the app. You are not able to lock some specific chats within the app by this time, but even an app-wide lock method will come out to be a useful feature.
At this time, you can download the update on the App Store.
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