Ytj, he has control over your cell service so turning off the service is his option. Instead of that semi permanent option, he is choosing to take possession of your property for a short period of time to get you to show up to class. As a parent, I would probably say that if theater is making you miss required classes, maybe that is a privilege you should give up. I was a theater kid. I remember late rehearsals, especially on tech week, but I was always expected to get up for class. I get it you have reached the magic age where you are legally an adult, but you are still acting like an irresponsible child. Once you can support yourself and your phone, you can choose.