How do you get all contact back if deleted?

To recover deleted contacts, first check if your device has a backup option, such as google Contacts for Android or iCloud for iOS, and restore from there. You can also look for a “Recently Deleted” folder in your contacts app, which might allow you to restore them directly. If you use a third-party app for contact management, check if it has its own recovery feature. Lastly, consider reaching out to your service provider, as they may have backup options available.