Easy Way to Delete all Contacts from iPhone at Once

This is my favorite way to fix my iPad or iPhone contacts when they get screwed up (duplicate contacts, etc.):

"...go to the Info tab in iTunes (when your iPhone is attached). Change the "Sync Contacts with" option to something else that has no contacts in it." e.g. a gmail account, yahoo acct, etc." Now sync. Afterwards you can change back to whatever you had before.



Source and thanks: How to delete all contacts from IPHONE at once | iPhone and iPad Forums



This usually happens if you are syncing your contacts to multiple sources. Pick just one. I picked Outlook for syncing contacts (and mostly only backup pictures taken on the iPhone to iCloud).



Now that you've done that, here's how to:

Remove iCloud Calendar from Outlook

How to sync your iPad with Outlook

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