On an iPhone you can set up a record with your medical information (Your name, blood type, allergies, next of kin, etc) which can be accessed without unlocking

On an iPhone you can set up a record with your medical information (Your name, blood type, allergies, next of kin, etc) which can be accessed without unlocking the phone, presumably the idea behind it is if you've been in an accident the attending medic can use that information to help treat you and let people know what's happened