Sometimes you need to clear out all your iPhone contacts and start from scratch because you are syncing from different services such as iCloud and Google.  They all get combined into one messy list.  In this case it's best to reset your contacts and resync and thereafter remove multiple contacts or remove them one by one.

Step 1 - Tap 'Settings'

 See Below

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Step 2 - Tap 'Mail, Contacts, Calendars'

 See Below

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Step 3
Choose which account you want to delete contacts from and set contacts switch to “Off”.  If you want to revoke app access to your contact list you can do this on your iPhone 6.
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