title: To block the out going call from my android app.
body: <p>I want to make an application in which once the application starts, it will show two button(start and stop button) and once the user clicks the start button the call function will be blocked for the time period till the user again start the application and click the stop button to stop this function. any help please its urgent</p>
  
  <p>in short I Will tell I want to block the outgoing call from my phone by using this activity only</p>
  
  <p>please is there any way to do so???</p>