title: check or reading sms from inbox in unity
body: <p>I need to implement a small text ui to show sms message from inbox in unity.
  After searching, I only find how to use Application.OpenURL to send a sms message. </p>
  
  <p>Does anyone know how to check or sms message in unity without opening default sms app?
  My test environment is Nexus 6p.</p>