title: Make iPhone vibrate: AudioServicesPlaySystemSound(kSystemSoundID_Vibrate) undeclared
body: <p>I want to make iPhone vibrate and I found the code</p>
  
  <pre><code>AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
  </code></pre>
  
  <p>but Xcode 4.3.2 reports error: undeclared identifier kSystemSoundID_Vibrate</p>
  
  <p>What's the problem?</p>