One of the difficulties long faced by emergency services personnel is how to locate next of kin for (or obtain other necessary information about) a victim who is unconscious, dead, or otherwise unable to respond to questions. Even if the victim is carrying one or more forms of identification which have remained with him (such as a driver's license), those items don't necessarily provide information about where and how relatives or other interested parties can be reached, resulting in delays as officials try to track those people down through additional means.

This issue has been addressed through a variety of means over the years, as many people have taken to carrying lists of emergency contacts (and vital medical details) in their purses and wallets, or wearing items such as bracelets and necklaces with such information engraved on them.

Now, Bob Brotchie, a paramedic from England has launched a campaign to get people to store "In Case of Emergency" (ICE) information in an item that has become ubiquitous in many parts of the world: cell phones.

The scheme proposes that people store ICE information into the address books of their cell phones, where it can be retrieved by emergency workers.  Storing ICE Mom for example or ICE Husband and the contact numbers will clue in emergency personnel how to reach the people you would chose to be contacted if the unthinkable should happen.
 
http://en.wikipedia.org/wiki/In_case_of_emergency