 If you want to delete all the duplicate contacts on your iPhone in one go, download Duplicate Contacts Fixer from the App Store. Tap on Find Duplicates button at the bottom and it will show you all the duplicate contacts on your phone. And from here you can delete all these duplicate contacts in one tap. You can also take a backup of your contact list so that if something goes wrong, you can restore your contacts. If you found it helpful, like, share and subscribe for more.