How to retrieve the deleted phone contact by vivo mobile phone?

After deleting the contact, the vivo phone cannot be restored without backup.

Supplementary explanation:

It is recommended to back up important data in time during the use of mobile phones to avoid losses caused by data loss.

The method of backing up contacts by vivo mobile phone: Go to mobile cloud service-Contacts-Back up immediately, and then back up. Click Restore to restore the backed-up contacts.