Lost contacts
I lost all my contacts and can’t find how to restore from my iCloud account prior to today’s date
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If they are missing on a all your devices, see this document --> If you accidentally deleted your calendars, bookmarks, or contacts from iCloud - Apple Support
If they are only missing on one device, make sure you turn on iCloud syncing for Contacts and sign into iCloud on your device missing the Contacts.
Click on this link to learn how to 'Set up iCloud on your iPhone, iPad, or iPod touch' --> https://support.apple.com/HT208681