There are several different configuration options. A ~3 second hold of vol+power brings up the emergency call screen, and also locks the phone. If you keep ho

There are several different configuration options. A ~3 second hold of vol+power brings up the emergency call screen, and also locks the phone. If you keep holding for longer, it starts a countdown to call emergency services unless you release in time (I'm not going to test to see what that limit is) You can also configure so that 5 button presses calls emergency services.