Unlock Your iPhone With Your Previous Passcode
If you’re always changing your iPhone’s passcode, you’ll love this feature. With iOS 17 you can now unlock your iPhone with your older passcode in case you forget the new one.
You’ll only be able to do this for the first 72 hours after you change your passcode, but that should be more than enough time to memorize your new one before it’s too late.
Of course, using this feature might be a safety issue, especially if you suspect someone knows your passcode. Fortunately, you can also expire your previous passcode immediately after you set a new one. Just be sure to remember your new passcode.