I reproduce this letter to today's Daily Telegraph (there is no lasting link to Letters to the Editor):
SIR - A friend tells me that paramedics in America encourage mobile phone users to store an ICE ("In Case of Emergency") number in their phone directory.
Apparently, the idea came from a paramedic who found that, although most victims carried mobiles, no one knew which number to call.
It seems like an excellent idea to me.
Me too! So much so, I've already added mine!