title: Get Context in a Service
body: <p>Is there any reliable way to get a <code>Context</code> from a <code>Service</code>?</p>
  
  <p>I want to register a broadcast receiver for <code>ACTION_PHONE_STATE_CHANGED</code> but I don't need my app to always get this information, so I don't put it in the <code>Manifest</code>. </p>
  
  <p>However, I can't have the broadcast receiver be killed by the GC when I need this information so I'm registering the broadcast receiver in a <code>Service</code>. </p>
  
  <p>Hence, I need a <code>Context</code> to to call <code>registerReceiver()</code>.
   When I no longer need the <code>ACTION_PHONE_STATE_CHANGED</code> I <strong>unregister</strong> it.</p>
  
  <p>Any tips?</p>