I once punished my then-seventh-grader by locking all the apps on his iPhone for a week with a passcode. A few days later he forgets he's been punished and send

I once punished my then-seventh-grader by locking all the apps on his iPhone for a week with a passcode. A few days later he forgets he's been punished and sends a text in front of me. "Hey! I thought I locked that down!" Turns out he found the instructions online to backup his phone and change the passcode. It took a bit of effort and technical understanding, and since I didn't even know it was possible, let alone that easy, he didn't get in trouble. (Though I told him if he did it again, he'd be in Serious Trouble, which is the top level of trouble above big and major). I'm a geek - if you can out-tech me, you win.