title: interactive ussd session(multi step) does not work on android 8(Oreo)
body: <p>I am currently working with Telephony Manager(USSD response) available in android api level 26(Nexus 6P). For single step ussd session, it's working.</p>
  
  <p>reference:
  <a href="http://codedrago.com/q/140674/android-telephony-telephonymanager-ussd-android-8-0-oreo-does-android-8-0-api-26-support-sending-and-repying-to-ussd-messages" rel="noreferrer">http://codedrago.com/q/140674/android-telephony-telephonymanager-ussd-android-8-0-oreo-does-android-8-0-api-26-support-sending-and-repying-to-ussd-messages</a></p>
  
  <p>example:</p>
  
  <p>USSD request : "A"        (ussd session initiates)</p>
  
  <p>USSD response : "X"       (ussd session terminates)</p>
  
  <pre><code>    TelephonyManager =  telephonyManager(TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
      Handler handler = new Handler();
      TelephonyManager.UssdResponseCallback callback = new TelephonyManager.UssdResponseCallback() {
          @Override
          public void onReceiveUssdResponse(TelephonyManager telephonyManager, String request, CharSequence response) {
              super.onReceiveUssdResponse(telephonyManager, request, response);
              Log.e("ussd",response.toString());
  
          }
  
          @Override
          public void onReceiveUssdResponseFailed(TelephonyManager telephonyManager, String request, int failureCode) {
              super.onReceiveUssdResponseFailed(telephonyManager, request, failureCode);
              Log.e("ussd","failed with code " + Integer.toString(failureCode));
          }
      };
  
      try {
             Log.e("ussd","trying to send ussd request");
             telephonyManager.sendUssdRequest("*123#",
                      callback,
                      handler);
          }catch (Exception e){
  
  
              String msg= e.getMessage();
              Log.e("DEBUG",e.toString());
              e.printStackTrace();
          }
  </code></pre>
  
  <p>but for interactive ussd request-response(multi-step), it's not working. 
   Multi step scenario is as follows:</p>
  
  <p>step # 1. </p>
  
  <p>USSD request : "A"        (ussd session initiates)</p>
  
  <p>USSD response : "X"</p>
  
  <p>step # 2.</p>
  
  <p>USSD request : "B"        (ussd session continues) </p>
  
  <p>USSD response : "Y"</p>
  
  <p>step # 3.</p>
  
  <p>USSD request : "C"      </p>
  
  <p>USSD response : "Z"     (ussd session terminates)</p>