PIN protection will lock all 'Steps backward' - i.e. lowering the blocker level, deactivating the blocker, removing sites from your blacklist, unlocking apps, turning off Uninstall protection.
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How do I set my PIN for Android?

To set a PIN, go to the Commitment tab > PIN Protection or Top Left Menu > Setup Device Controls.
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​Can you send me my PIN? I've forgotten my PIN
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​We can't respond to individual PIN requests and due to the nature of the product, we won't give you your PIN early upon request.
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Your PIN delay period settings apply.
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Request your PIN by going to the Commitment tab > PIN Management > Request PIN > Tap and hold to confirm > Submit request.

The PIN will then be delivered by email and push notification after the delay period that you set.