Q: React Native Firebase signOut() Simple question on Firebase and react native - all of the docs I see state to sign out a user it is simply: 
firebase.auth().signOut()

This seems too simple. How does it know which user to sign out? Do I need to work with getCurrentUser() or getInstance() to be able to sign out the appropriate user? I am not seeing much documentation on this. 
https://firebase.google.com/docs/reference/android/com/google/firebase/auth/FirebaseAuth.html#signOut()
https://rnfirebase.io/docs/v5.x.x/auth/phone-auth

A: It's internal to Firebase. There is only one active user, the one returned by currentUser. signOut will logout that user.

A: Since you can only have one user signed in at a time, signOut always affects just the one current user.  It is really just that simple.  All it has to do is delete the user's auth token.
