I have an iPhone 5S and yesterday for some unknown reason it suddenly died on me. Annoying as that was, because I was forced to reinstall everything, I was also forced to upgrade to the latest IOS.
Eventually when everything was up and running I noticed this little App on the Home page with a heart on it that Id not seen before, so I pressed it. It was a Medical Health App that allows you to do all sorts of things but more importantly for me, record my medical information.
Recently there has been some posts about Medical identity bracelets etc but this does all that for you. And, more importantly it is cleverly set up so that when your phone is locked anyone who wants to look in your phone in an emergency can press the word "emergency" and gain access to all your medical information and contact details. In short instead of me paying for Medic Alert to list all of this info, I can store it in my own phone for nothing! Most Paramedics will look at someones phone to get next of kin details and identity so they will know that this exists.
Sorry this is only for people with iPhones with IOS 8 and above but hope its helpful.
Here is an easy to follow explanation on how this works and how to set it up: