title: How to fetch firebase firestore data at locked mode
body: <p>I have developed an android app using Firebase, cloud firestore at test mode. Test mode means 'Anyone with my database reference will be able to read or write to my database'. Then i have changed the security rules to '<strong>allow read, write: if false</strong>' for prevent this. It is called locked mode.
  But at lock mode data is not fetched. There is no proper documentation at google for this. What can i do?</p>