Delete a contact from the Apple iPhone, iPad or iPod touch with these steps.
1. Open the Contacts app.
2. Choose the contact you wish to get rid of.
3. Tap Edit. (If you don’t see an Edit button, view this post.)
4. Scroll down and tap Delete Contact.
The ability to delete multiple contacts is not available within the Apple iOS system. You will need a third-party app such as Cleanup for such capability.
If you receive an error that says “The linked Facebook contact will not be deleted”, see the post: Cannot Delete Facebook Contact From iOS