Delete Contacts (com.gn.android.contactdeleter) on Google Play
Delete Contacts is a free (ad-supported) app that allows to delete all contacts and groups with one click. It's useful when you need to delete all contacts before selling your phone or you want restore the contacts from a backup. Download it for free!PERMISSIONSInternet Access:Needed for downloading ads and for completely anonymous usage statistics. Usage statistics can be disabled.Read/Write contact data:Needed for deleting the contacts and groups.