How can I recover my iPhone contacts?
I lost all my contacts, how can I recover them
[Re-Titled by Moderator]
iPhone 7, iOS 15
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If you are using iCloud, make sure you have contacts set to sync.
Change your iCloud feature settings [iOS and Mac] - Change your iCloud settings - Apple Support
'If you accidentally deleted your calendars, reminders, bookmarks, or contacts from iCloud', click here --> If you accidentally deleted your calendars, bookmarks, or contacts from iCloud - Apple Support
If you do not use iCloud for Contacts you may be able to restore from a backup but that entails resetting your entire device back to the time you made the backup.
Click on this link to discover how to 'Restore your iPhone, iPad, or iPod touch from a backup' --> Restore your iPhone, iPad, or iPod touch from a backup - Apple Support
or watch this video if you're using a Mac to do this:
https://www.youtube.com/watch?v=Jbp3gGTQygg