My dad took away my PC when I got bad grades and put it in his room.

I took the mobo, CPU, RAM, hard drive and PSU out of the case, put them in my backpack and went to my friends house. He never noticed.

That said, I still couldn't use the PC when I was at home. Physically taking away the machine wasn't really the punishment.

This would apply to cell phones and such too. Sure they might figure out some workaround that works sometimes, but it won't be the same.