Apple's Health app allows you to create a Medical ID for emergencies. The Medical ID can be accessed when your iPhone is locked by taping Emergency, then Medical ID. It contains various medical information that you can add, such as medical conditions, allegories and more. You can also add emergency contacts, which will be notified with your current location when the Emergency SOS option on your device is activated.
You can add as many emergency contacts from your Contacts list as you want in the Health app under the Medical ID section, however some contacts may be grayed out when you try to add them. This is because the contact card does not have a number or they're synced to your Facebook contacts. Here's how to add a grayed out contact as an emergency contact in the Health app:
- Open the Phone app on your device and select Contacts.
- Tap the name of the person you want to add as an emergency contact on your Contacts list.
- Scroll down to Linked Contacts then tap the iCloud tab.
- Tap "Use This Name for Unified Card" and that person will no longer be grayed out in the emergency contact section of your Medical ID.