How do I get contact back
I lost all my phone numbers
iPhone 12 Pro Max, 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] - https://support.apple.com/HT207689
'If you accidentally deleted your calendars, reminders, bookmarks, or contacts from iCloud', click here --> https://support.apple.com/HT205018
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' --> https://support.apple.com/HT204184
or watch this video if you're using a Mac to do this: