IPhone: How do I delete all my contacts WITHOUT ITUNES?

I'm giving my dad my iPhone, so i'm trying to delete all the contacts. It's a jailbroken iPhone so I can't plug it back into my iTunes because it will make me resync it which I don't want. Anyways how do i delete my 800+ contacts without itunes?

Its gonna suck. But you're gonna have to click on each contact press edit then scroll to the bottom and press delete. It may take a while considering you have 800 contacts. Sorry/

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