How do I restore my contacts after accidentall deleting them iPhone 7
How to restore contactsWithout PC on an iPhone 7
iPhone 7, iOS 13
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If they were saved in iCloud:
If you accidentally deleted your calendars, bookmarks, or contacts from iCloud - Apple Support
If they were not saved in iCloud, but another internet account, you need to check with their support.
If it was saved only on iPhone, you would need to restore a backup from when the contacts were still there.
Good luck!