This is an easy one. What happened to me when I walked out after getting grounded, and I'd urge YOUR parent to do the same thing.
Call juvi, have the cops pick you up, spend a couple nights. See how much you want to do that again.
And there is so much we, as parents, can do to unruly teenagers within the confines of the law. Let me remind you of some things.
1. As an adolescent, you have no posessions. Everything you have belongs to your parents. The only things they must provide you with are shelter, sleeping space, food and clothes, and make you go to school. Anything else is a luxury they can take away.
2. As an adolescent, you can't legally agree to any contract, like a cell phone or other mobile device. Those can be turned off and taken away as well.
3. They can restrict your movement as much they feel necessary. If that means locking the backdoor so you can't leave, barring your windows so you can't leave, picking you up and dropping you off for school.
Trust me, there is SO much you can do, as a parent, to coerce your children. Hopefully it won't have to come to that.