title: How to block/unblock all incoming/outgoing calls/text messages in android?
body: <p>I am developing an android application for teenagers, they <strong>can not do/receive</strong> any <strong>incoming/outgoing calls/text messages</strong> during driving and also they can change status either he/she is driving or not. In my application I want to handle both situations <strong>Block/Unblock incoming/outgoing calls/text messages</strong>. If you have any idea related to this question than please share with me.</p>
  
  <p>Thanks.</p>