Remember this because it could save your life one day. Press the iPhone side button and any one of the two volume rockers until you see the Emergency SOS Slider. Drag the Emergency SOS slider to call emergency services. If you continue to hold down the side button and volume button instead, an alert sounds and a countdown timer starts. Continue to hold down the buttons until the timer comes to an end and emergency services will be called.
Again, in the back of your mind, bookmark the side button Emergency Services shortcut because you never know when it might help you make it through your own life and death ordeal.