firebase - Flutter - Your Cloud Firestore database has insecure rules

Question

I have a collection called users where I am checking if new users mobile no is present or not. If It is present then I am performing phone authentication for that user then storing uid as a field in document.

If user is coming for the first time, he is not authenticated and I am performing read operation from users collection. Now every time I am getting Your Cloud Firestore database has insecure rules email from google.

Below is the rule I am using. Please let me know how can I make it secure.

rules_version = '2';
service cloud.firestore {
  match /databases/{database}/documents {
    match /{document=**} {
      allow read: if true;
      allow write: if request.auth != null;
    }
  }
}

Answer 1

Waitting for answers