title: AVSpeechSynthesizer,AVSpeechUtterance can't work on the iPhone 5s with iOS9.2.1(13D15) or iOS9.1.1
body: <p>I want to make a simple TTS(TextToSpeech) on <code>iOS</code> with <code>AVFoundation/AVFoundation.h</code> and I tried to go with <code>AVSpeechSynthesizer,AVSpeechUtterance</code>. </p>
  
  <p>However the iPhone 5s with <code>iOS9.2.1(13D15)</code> or <code>iOS9.1.1</code> can't speech the text and without any voice. At the same time, it can work on iPhoto 6 or 6Plus with <code>iOS9.2.1</code>.</p>
  
  <p>Who can tell me the reason about that ?(I build the App with Xcode 7.2) Thanks!</p>