You can set up emergency information for first responders or others to view from your lock screen, such as your emergency contact and medical information (blood type, allergies).
Anyone who needs to view your information should:
From the lock screen:
To add your name or a short message to your lock screen for anyone who finds your phone:
If Android Emergency Location Service (ELS) works in your country and on your carrier's network and if you haven't turned off ELS, when you call or text an emergency number, ELS will send your location to authorised emergency responders to help them to locate you.
If ELS is off, your carrier might still send the phone's location during an emergency call. For more information, check with your carrier.
To turn ELS on or off:


To learn more about ELS, read Google's help.
Your phone can receive free alerts to inform you of public safety messages, threats to life and property (like extreme weather) and other emergencies.
When an emergency alert is sent out, 
You can turn most alerts on or off and adjust alert notification settings. Governmental alerts cannot be turned off.