title: clear USSD response Messages from screen
body: <p>I am calling on USSD  number using this</p>
  
  <p>String ussdCode = "*" + "123" + Uri.encode("#");</p>
  
  <p>startActivity(new Intent("android.intent.action.CALL", Uri.parse("tel:" + ussdCode)));</p>
  
  <p>But it shows the response message on screen .
  How can I clear these messages from the screen??</p>
  
  <p>Thanks in advance</p>