iPhone's Emergency SOS feature – Get help in an emergency situation!
The iPhone's Emergency SOS feature could literally save lives, so make sure to know how it works.
Click the power button five times in a row to bring up a secret menu. In an emergency, you can drag on the SOS slider to automatically call emergency services. Your phone will send your location to first responders at the end of the call (unless you choose the "cancel" option, offscreen on the photo).