This is a workaround feature that comes after the introduction of iOS 12 attached with the Screen Time feature. This trick technically uses Apple’s App Limits attribute to make apps inaccessible after a set time. Here’s how to passcode lock an app on iPhone devices. This feature prompts a warning when the set time limit expires and automatically locks the app. To re-access the app, users need to provide the Screen Time passcode. Since this is a workaround feature to passcode lock any app on the iPhone, it doesn’t allow you to do the same for the Phone app. Also, this feature doesn’t let you see notifications for apps that are locked.
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