https://support.apple.com/en-us/ht201412 (which is different from clearing RAM that is being discussed in this thread)I too wondered. With the 7, we would long hold the power button, until; the apple re-appeared. BUT, WARNING!!! If you do this on the X, it will invoke SOS, emergency calls!!!
So, Apple Geniuses... What is the NEW way to do a reset? (not just a power off/on, but RESET?