For samsung galaxy's, you can put your ICE contacts into the emergency contact group, and then when the screen is locked, if you hit "emergency call" it has a button with a person and an alarm light which shows your emergency contacts when you press it. You can only call those numbers if there are any, or dial emergency numbers, but no others.
DD has learnt to call DH from my phone and me from DHs phone using this :lol: she knows she will talk to us too, and that she's not diallinga random number! :lol: