No one likes to think of worst-case scenarios, but it's good to prepare for them. So if you have an iPhone, you'll want to take it out right now and set up this feature.
It's called Medical ID, and it's part of the health app that comes with iPhones running iOS8 or higher systems. It only takes a couple of minutes to enter life-saving medical information: the number of the person you want called, the medications you take, any allergies you have, and your age. You'll also want to make sure first responders can get to the info from your locked screen, in case you're unconscious after an accident.
To see a step-by-step tutorial, watch the video below. It won't take long (promise!), and you'll be glad you did in case you are ever in some kind of emergency.
If you have an older model iPhone or an Android, no worries. Just download an in-case-of-emergency (ICE) app, available on iTunes or Google Play for free. (Just Google ICE app, and you'll find several.) Or take a screenshot of your medical information or emergency contact, and use it as the wallpaper for your locked screen.
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