how to delete multiple contacts in ios7??

To permanently delete contacts on iPhone, you can use a iPhone data eraser,there are some iPhone data eraser software in the market, but few can be completely and permanently delete contacts on iPhone, even if data has been cleared, some professional iPhone data recovery software can recover them later. Please read this use guide about how to Permanently Erase iPhone Data Before Selling your iPhone.So no one can get you personal information and data from iPhone,after you sell, donate or give it away.