Tap your name and Apple ID in the top left of the Settings app. Select “iCloud” from the Apple ID page. Switch off “Contacts” by turning the green button to grey. You have two options: delete or keep your previously synced contacts.
If you have made a mistake and linked two sets of contacts, you can simply remove them from the contacts app. Open the contact’s information by tapping on it, then tap on the main menu in the top-right corner and choose “View linked contacts.” Now tap on the “Unlink” button to unlink all of your contacts.
Linked contacts are people who share similar connections in your iPhone’s address book. If you’ve combined Facebook friends or iCloud contacts with your iPhone contacts, you may have noticed that some of them match only with partial information.
A linked contact is a method of connecting one contact to a related contact. For example, you might wish to link all of the employees in a certain department. To do so, open one of those contacts and scroll down to the bottom. Tap the section labeled Linked Contacts (Figure C) and then choose Add Link Contact from the drop?
To delete a contact in Contacts on iCloud.com, select one or more contacts from the All Contacts group in the sidebar, then press Delete. After that, click Delete.