title: How to delete only the phone number in an android phone programatically
body: <p>i have a Phone.Lookupkey and Phone.CONTACT_ID and i want to delete only the phone number that it points to, i dont want to delete all the contact information.</p>
  
  <p>How do i put empty value? 
  just update it to ""?</p>
  
  <p>Thanks, </p>