title: Block incoming calls and sms in android
body: <p>I tried to block incoming calls and sms in android for given numbers. after we block a number, when we getting a call from that blocked number, caller can here voice message as <strong>Number Busy</strong>. </p>
  
  <p>But is there any way to change this voice message to <strong>Power off, No service, The number is not in service</strong> messages ?</p>