Just turned 14 a couple of weeks ago, packing his stuff because we took his phone away.
2 weeks ago he was at the police station in the middle of the night because he snuck out.
Now he's kicking off because he hasn't got his phone.
Saying he will leave and never see us again. 
He has no phone and no money.
I was trying to talk some sense into him in a calm
manor but he was being so painfully unreasonable that I ended up shouting.
He's now utterly trashing his bedroom. So he's still hear at least.
But if he leaves, what happens next? Obviously I call the police but what happens then?