title: Link Phone Number with Facebook and Gmail account in Firebase on Web
body: <p>I'm creating a web app in React with firebase services. I have Google and Facebook login on the login screen and after login user gets an option to link their phone. I use Firebase <a href="https://firebase.google.com/docs/auth/web/phone-auth" rel="noreferrer">Phone Auth</a> for this. The user is already signed then they Auth using the phone. I want to Link Phone Auth user object with facebook/google account. </p>
  
  <p>Going through the docs I was not able to find the solution that suits my use case. Help will be appreciated. </p>