For what it's worth, holding down the power button no longer guarantees you're gonna shut down the device. On the iPhone X (at least, maybe earlier models, maybe later), you have to hold down a combination. It doesn't take long to figure out, but it's a really stupid change.
Is there a list of devices anywhere for which this doesn't work?
It's worked in anything I've tried (haven't tried latest iphones) with only a momentary power switch on it.
I was under the impression it was some kind of legal requirement somewhere, and that's why it was so standard.
