In case of accident or unability to communicate, a simple feature allows to register your essential information to give to the rescuer.
By this way, the first person on your side can consult your medical file and call a contact of your choice or an emergency number without unlocking your smartphone.

To register your emergency information:
Open "Settings" app ,
- tap on "About phone", at the bottom of the screen,
- tap on "Emergency information" and enter what you think usefull,
- tap on "+ Add information" to enter your medical information,
- tap on "+ Add contact" to indicate which person(s) you want to be alerted.

For the rescuers:

Smartphone on, but locked
- shortly press on/off key to switch on the smartphone's screen,
then
- swipe the screen as for unlocking it.

Smartphone off
- long press on/off key to start the smartphone.

then
- do not enter any password, tap on EMERGENCY then on EMERGENCY INFORMATION,
and/or
- tap on CONTACTS then select a contact to launch the call.


NB: this article only concerns smartphones powered by Android™ system.