title: Is it possible to check a contact whether it is exits in contact list of iPhone or not?
body: <p>I am developing an app in which i have to save  contact in address book, but if the the contact is already saved in contact then it should not save.</p>
  
  <p>But i have no idea is it possible to check a contact whether it is exits in contact list of iPhone or not?</p>
  
  <p>Any help would be appreciated.</p>
  
  <p>Thanks in advance.</p>