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If you sync contacts with iCloud, you may be able to restore contacts that were unintentionally deleted using the following steps:
1: On iCloud.com, click
in the toolbar, then click Data Recovery.
2: Click Restore Contacts.
Available versions are listed by the date and time they were archived.
3: To the right of the version you want to restore, click Restore.
There may be more versions than can be displayed. Scroll to see them all.
Note: Wait until iCloud finishes restoring your contacts before you change them. During the restore process, any changes you make aren’t saved.
Restore contacts stored in iCloud on iCloud.com
We hope this helps!