You can add or remove emergency contacts from the Health app on your iPhone. Here’s how:
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Open the Health app and tap the Medical ID tab.
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Tap Edit, then scroll to Emergency Contacts.
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Tap the + to add an emergency contact.
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Tap a contact, then add their relationship.
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Tap Done to save your changes.
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Here’s how to remove emergency contacts:
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Open the Health app and tap the Medical ID tab.
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Tap Edit, then scroll to Emergency Contacts.
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Tap the – (minus) next to a contact, then tap Delete.
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Tap Done to save your changes.
(BTW, you can’t set emergency services as an emergency contact.)
(This how-to is based on my experiences and info on Apple’s support pages — where the images sometimes come from.)