In Case of Emergency (ICE) is a program that enables first responders, such as paramedics, firefighters, and police officers, as well as hospital personnel, to contact the next of kin of the owner of a mobile phone to obtain important medical or support information (the phone must be unlocked and working). The phone entry (or entries) should supplement or complement written (such as wallet, bracelet, or necklace) information or indicators. The programme was conceived in the mid-2000s and promoted by British paramedic Bob Brotchie in May 2005. It encourages people to enter emergency contacts in their mobile phone address book under the name "ICE". Alternatively, a person can list multiple emergency contacts as "ICE1", "ICE2", etc. The popularity of the program has spread across Europe and Australia, and it has started to grow into North America.
For security purposes, many mobile phone owners now lock their mobiles, requiring a passcode to be entered in order to access the device. This hinders the ability of first responders to access the ICE phone list entry. In response to this problem, many device manufacturers have provided a mechanism to specify some text to be displayed while the mobile is in the locked state. The owner of the phone can specify their "In Case of Emergency" contact and also a "Lost and Found" contact. For example, BlackBerry mobiles permit the "Owner" information to be set in the Settings → Options → Owner menu item.
Alternatively, some handsets provide access to a list of ICE contacts directly from the "locked" screen.
For the iPhone, you can download apps that can create a iPhone lock screen with emergency details, e.g. "Emergency Info Screen" app. Most ICE iPhone apps are simple to use. They can create a lock screen that displays your emergency contacts, blood group and any personalised medical information you wish to add. This way, even if your phone is locked, rescue workers and good samaritans will know who to contact just in case something happens to you.
Android Phones. I have found the following app easy to install on my S3. JD