title: I use NSJSONSerialization in my app, can this app function well under IOS 3.x?
body: <p>I am a newbie in IOS development, and my app use the class NSJSONSerialization to parse JSON data from the configuration file.</p>
  
  <p>now my question is, can this app function well under the version IOS 3.x ? by the way, the NSJSONSerialization is a new class in IOS 5.0. </p>
  
  <p>because my iphone3GS was broken , I can't test it now.</p>