I had a relative ask me about "I.C.E." from something seen on the internet or a chain e-mail. My response was to forget about it and not partake.

I'd rather have the personnel on scene not worry about digging through my cell phone to possibly look for an "ICE" listing.

Besides, in the worst case scenario, let's say you're separated from all identification. What makes anyone think their cell phone will be left behind or still attached? Or working, for that matter?