title: Standby and sleep modes in a mobile phone
body: <p>Consider the below case:</p>
  <ol>
  <li>A mobile phone is booted. At this moment it can be said that it is in <strong>run mode</strong> where the power consumption is more.</li>
  <li>If no activity is done, after sometime the screen goes dim.</li>
  <li>After further inactivity, the screen completely goes off.</li>
  </ol>
  <p>Now my question is: can we say that the mobile phone was in standby mode and sleep mode in above steps 2 and 3 respectively?</p>
  <p>Another question is, suppose we are playing some music and we leave the mobile like that for sometime. In this case also the mobile phone goes through 2 and 3 steps mentioned above. But the only difference to earlier scenario is that music is being played in the second scenario. In this case, can we say that mobile phone was in standby and sleep mode respectively in 2 &amp; 3 steps when the music is being played.</p>