How to delete *all* contacts from an iPhone?

[doobry]

I have outlook running on my phone and somehow it has created 4 versions of each contact so I now have 6000 contacts, 5400 work contacts and 600 personal contacts.. If I tell outlook to delete them it only takes off one set of dupes so I still have almost 5000 contacts.. Is there a way to just wipe them all from the phone please so I can start again? Everytime someone rings me it says "Joe bloggs or 3 others" which is annoying..!

Thanks in advance!

 

[0128672]

Is there only one version of each contact at Outlook.com? If so, I'd delete the app and reinstall.

 

[BrianBaughn]

Contacts in the Outlook app or in the Contacts app?