MedicAlert provides your emergency medical details to those who need it, via their emergency telephone number (staffed 24 hours a day, 7 days a week). They are able to converse in over 100 languages. Sponsorship or your membership is available if you are unable to afford the small annual membership fee (which is around £30 GBP a year).
MedicAlert operates in other locations around the world, including but not limited to the USA, Canada, Australia and New Zealand. See http://www.medicalert.org/about/worldwide-locations.