title: Listening to outgoing/incoming calls
body: <p>I'm a newbie android developer, I'm trying to develop an application; a background service which listens to incoming/outgoing calls/messages. I want to learn how to:</p>
  
  <ul>
  <li>I want to end the phone calls from specific numbers</li>
  <li>Delete the messages from Inbox/drafts/sent items </li>
  </ul>
  
  <p>May I get some leads to achieve this?</p>