Firebase Auth using phone number and password

Question

I am developing Android app using Firebase. Because of that, I want to use Firebase Auth. I have following requirements:

• Register/Log in using Facebook
• Re

Answer 1

If you have both email and phone of your user and you can use Admin SDK, then perhaps you could exchange users phone number to his email and login with email and password in the background.

Something like this (node.js)

admin.auth().getUserByPhoneNumber(phoneNumber)
    .then(user => {
        firebase.auth().signInWithEmailAndPassword(user.email, password);
    });