Verizon offers a phone (Samsung Haven) designed for seniors that emphasizes simplicity and ease of use. It has both a dedicated 911 key and a dedicated ICE key. The ICE key brings up a list of up to 3 contacts to call in case of emergency, along with a medical notes field where one can provide important information to first responders.
The ICE contacts do not have to be in the regular contact list, but if they are, they are highlighted in red there, so the user can find them easily even without pressing the ICE key.