title: Permission to know phone number
body: <p>I have an android game in play store and have around 150 active users.<br>
  I am adding leaderboard in the upcoming update
  so that people can compete with each other.<br>
  My app does not require access to any specific permission.<br>
  However I want to know if there we can know the contact number of a user who downloads our app so that we can
  send a congratulation message when someone reach at the
  top of the leaderboard.<br>
  Can anyone please tell me how it can be done in Android and if yes, where can we view the number?</p>