Use ContactDel to Save Time when Cleaning up Your Address Book.
now there is an App for this: ContactDel, developed by NotionInMotion.com, it can remove all contacts by a touch of a button, no sync-ing, no connecting to computers. Just touch a button, as simple as that!
In addtion, ContactDel provides many ways to delete your contacts in batch on iPhone and iPod Touch. When cleaning up your address book with ContactDel, you can save a lot of time.
1. Delete All: The easiest way to delete all contacts on your iPhone and iPod Touch, just push the button, the App does the rest.
2. Delete by Name: list your contacts by names, check-mark in batch and delete in batch.
3. Restore: you can restore major information of previous deleted contacts at anytime.
Note: only first name, last name, phone number, address, email can be restored. Contact photo, notes, homepage, and ring tone setting are permanently deleted.
Just search ContactDel in App Store, or search NotionInMotion.com
App Link: http://itunes.apple.com/us/app/contactdel/id399148990?mt=8
NotionInMotion.com is specialized in contacts management on mobile phones. Another App released by NotionInMotion.com is Synkontact, which can enable seemless transfer of contacts between iPhone and Andoid phone, or among themselves.
App Link: http://itunes.apple.com/us/app/synkontact/id399153906?mt=8