title: Detecting if user has in call status bar
body: <p>How do I detect if user is in-call or tethering? I have a subview for iAd like this:</p>
  
  <pre><code>_UIiAD = [[self appdelegate] UIiAD];
  _UIiAD.delegate = self;
  
  [_UIiAD setFrame:CGRectMake(0,470,320,50)];
  [self.view addSubview:_UIiAD];\
  </code></pre>
  
  <p>And it sets it wrong when the user is in call? How do I detect this?</p>