Re: Hi
Yes it's very frustrating when a phone has a passcode on so you can't get to the emergency contacts.
Re diabetic tattoos, bracelets etc - I wouldn't for a minute say don't get one, if you want one, but if you are found unconscious the emergency medical services will ALWAYS take your blood sugar, it will be among the very first things that they do. It's much more of an issue for members of the public, who are inclined to think that people having hypos are drunk.