You can block or unblock a number on an Android phone using the built-in Phone app's "Blocked numbers" menu.

You can block unwanted text messages on an Android phone by blocking the phone number with just a few taps.

If you want to unhide or remove a lock from an app, long press on the app, tap Don't Require Face ID and enter your Face ID or passcode. Your locked apps will now be unlocked and your hidden apps will ...