Contacts
I lost all my contacts. How do I restore them?
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If you were syncing contacts with iCloud, go to iCloud.com/Settings using a computer browser, Under the Advanced section at the bottom left, select Restore Contacts.
If you weren't syncing with iCloud, restore from your backup.
Restoring from a backup erases all data currently on your device. Any data newer than when the backup was made will be erased. A restore is an all or nothing restore.
Backup - Restore your device from an iCloud or iTunes backup