This is interesting, though they have been talking about ICE since before the london tube bombings.
I see some merit in the idea, though there are many variables, the big one being the phone is actually on the pt themselves - which probably makes it fairly useless for mass cas, it also assumes that the phone survives the accident to begin with, and it also assumes those people listed under ICE actually have a detailed history of the patient, and is not just a best friend who know sarah well but still has no idea about pertinent medical history
My point is, it should be promoted as an extra measure, but people should not solely rely on this alone, and should make every effort to find further information from other belonging the pt may have, as well as their presentation