title: How Apple APNS Feedback service works?
body: <p>I am developing an ipad application which uses apple push notifications.I heard about feedback service in APNS which can give the information about devices uninstalled the application or devices reformatted the iOS.</p>
  
  <p>I would like to know the complete details of what the APNS Feedback service offers?</p>
  
  <p>Any reference document or links for how to implement the feedback service in sandbox environment is highly appreciable.</p>
  
  <p>Thanks in advance.....</p>