If you haven’t already, it’s important to set up a Medical ID, which contains important information that can be accessed in an emergency without unlocking your device.
First up, open the Health app. Then press the Medical ID tab along the bottom, and tap Create Medical ID. From the next screen, ensure Show When Locked is turned on and then fill out as much or as little data as you like on the form. You can include any important information about medications or allergies, as well as your blood type.
At the bottom of the screen you can add some emergency contacts, whose phone numbers will be displayed on the emergency dialer screen along with that person’s relationship to you. Hit Done in the top right when you’ve finished.
You can test this is set up correctly by pressing Emergency from the lock screen keypad, then Medical ID.