I've "ice'd" my cell about 18 months ago...the wife had a heart-attack and we were relying on the old "med. info. in the wallet trick" to keep everything straight.
And w/the amount of information these newer cell phones can hold, you can practically put the info. in there.
HOWEVER...
just like everything else (where your personal information (PI) is concerned) you need to be pretty responsible about where your cellphone is at all times...much like your wallet...remember, you're making the PI available to whoever/whomever (Mr. Linguistic Guy, which is correct?

) gets ahold of your unit for whatever purpose.