title: why can sync.me app customize the incoming call screen?
body: <p>I have always been told that <code>"incoming call"</code> screen is not <code>customizable</code>, because of apple's controls. But this app has obviously modified the incoming call screen.</p>
  
  <p>link here: <a href="http://techcrunch.com/2012/11/15/sync-me-closes-4m-in-funding-to-scale-up-its-social-contact-syncing-ios-app/?utm_source=feedburner&amp;utm_medium=feed&amp;utm_campaign=Feed%3a%20Techcrunch%20%28TechCrunch%29" rel="nofollow">Check this</a></p>
  
  <p>Just wonder how this is done, because this app is on app store, meaning we don't need to root iOS.</p>
  
  <p>Can any one help?</p>