A free app for Android, by Funny Apps Zone.

If you have lost a number or deleted it by mistake, you don’t need to worry because this app can help you restore them all. It can restore contacts, photos, videos, audio files, and even recover the contacts from your phone’s memory card. It doesn’t matter if you have lost your contacts because of a factory reset or if you have deleted them by mistake.

The best part of this app is that it doesn’t require any root or special permission to work.

If you have lost your contacts, just open the app and press the “Restore contacts” button.