title: is Android not supporting USSD CALL?
body: <p>I'm trying to make a USSD call on my app </p>
  
  <p>I tried to do this :</p>
  
  <pre><code>Intent fastCall = new Intent(Intent.ACTION_CALL);
  String Num = "*100*200"+ Uri.encode("#");
  fastCall.setData(Uri.parse("tel:" + Num));
  startActivity(fastCall);
  </code></pre>
  
  <p>but I keep getting an error:</p>
  
  <pre><code>Connection problem or invalid MMI code
  </code></pre>
  
  <p>what can I do ? or should I just use <code>ACTION_DIAL</code>?</p>
  
  <p>any idea ?</p>