It’s a common worry that someone might try to unlock your iPhone without your consent if you leave it somewhere unattended, and since iOS allows several passcode attempts before it initiates a passcode lockout timer, it’s possible for someone to continue guessing your passcode time and time again. Unfortunately, iOS doesn’t provide any way to letting you know when someone does this, leaving the user completely oblivious to such attacks.
Enter Handcuff (iOS 13), a newly released jailbreak tweak by iOS developer Ahmed that alerts users to attacks of the aforementioned variety. If or when a passcode is entered incorrectly or a power down is attempted, Handcuff alerts the user to this activity via email and via text message and includes a selfie image of the offender trying to conduct said mischief.