1) I mention that I am registered with the Medic Alert Foundation, out of Turlock, CA, USA, with all that information registered with them. Access is using the code number on the "dogtag" around my neck. They have some fine looking jewelry as necklaces, watches, and bracelets, as well.
2) In the EMS professional magazines, they have "thumbdrives" available specifically for such information. However, I sometimes carry my thumbdrive, not set up as a medic alert device, on a neck cord. Also, not all EMS services have the field availability or capability to connect to a computer to read them.
3) The ICE (In Case of Emergency) listing in cell phones has good points, but I go with the bad ones, like, in a Mass Casualty Incident, is the phone you found the property of the person next to whom you find it? If you use the phone to access the ICE list, could you be activating a secondary IED? If you call the listing of "ICE T", are you going to be connected with the actor who portrays NYPD Detective Fin Tutuola on "Law and Order-Special Victims Unit"? (I've been printed in "JEMS" on this before, as well as having it in a string here on the city)