I am not sure whether phone auth (OTP) in Flutter can be used to create a user along with their details in Firestore. Or whether it can only used for user authentication.

Sign-ins using Firebase Authentication only create a user account that’s visible within the Firebase Auth product. It has nothing to do with Firestore. This is true for all type of authentication with Firebase Auth.

If you want to add user details to a document in Firestore, you’re going to have to write code to do that.

This is a bad response – the original poster is asking if it is possible to create a new FirebaseAuth record using just the Phone + OTP process, and not using the createUserWithEmailAndPassword call, not how to store custom user data in Firestore

What I am trying to achieve is:

1. An app that does not require email id at all for registration/signup, or login.
2. Registration page that requires user to fill their name, phone number and a few other details.
3. When user presses send OTP on the registration page, the number gets verified and a user profile is created in Firestore, and his details are saved.
4. If the user logs out, on login page user must be able to enter phone number, get OTP sent again, and be logged in into the same account.

Issue:

I am not sure whether phone auth (OTP) in Flutter can be used to create a user along with their details in Firestore. Or whether it can only used for user authentication.

If it is possible to use phone number (OTP) auth to create user profile in Firestore in Flutter, please help.

Most tutorials I referred to, only show how phone authentication can be done using OTP, but do not cover creating a profile using the same.