title: How to know whether I am in a call on Android?
body: <p>I want to know whether I am in a call.</p>
  
  <p>If I am in a call then start the service (service part is clear). How do I do this?</p>
  
  <p>While attending the call I need to call the service... I am unaware of how to do this? Any help?</p>