I want to get the same ID

Question

Good afternoon I wanted to know if it is possible to get the phone ID for the same functions or as in the example below. I want to put the ID that’s marked black under the "SMS". Is it possible to put? How can I do it? Below is the code.

private static final String TAG = FirebaseDatabaseHelper.class.getSimpleName();

private DatabaseReference databaseReference;

public TelaPolicia(){
  demoRef = FirebaseDatabase.getInstance().getReference();

}

public void createUserInFirebaseDatabase(String userId, FirebaseUserEntity firebaseUserEntity){
    Map<String, FirebaseUserEntity> user = new HashMap<String, FirebaseUserEntity>();
    user.put(userId, firebaseUserEntity);
    demoRef.child("SMS").setValue(user);
}