Haven't kept up with the thread recently.
Creme. I'm so sorry about your DS. From what you have said in the past, he seems like a sensible, caring and lovely kid. Having got teens myself, it's completely different parenting experience, and how you would treat a child isn't going to work.
If my DS had done this, I wouldn't mention it tonight. I would establish the usual calm, secure environment that he's used to, carry on as normal. I'd pick my moment, and ask if he wanted to talk about the events of last night, and what had made him feel so angry. I suspect it's lack of control and feeling like he's been treated like a child. It might be more. You guys have a good relationship, you will work through this. 
ps - I know about excessive phone use, both of mine do it. I've never confiscated their phones though, I'm not sure that will achieve much long term?
Parenting teens is hard going sometimes!
NSD today, the week is going well so far.
First Christmas presents bought, SJP perfume called Lovely, a tenner on Groupon. I've bought for DD and DN.