How to enable Auto Sign-in after successfully Sign-up? Flutter

[proven stream]

I'm trying to do on-page passwordless authentication with only phone number, and I want to implement auto sign-in after sign-up automatically, any ideas?

[snow finch]

  Future<bool> attemptAutoLogin() async {
    try {
      final session = await Amplify.Auth.getPlugin(
        AmplifyAuthCognito.pluginKey,
      ).fetchAuthSession();
      return session.isSignedIn;
    } catch (e) {
      rethrow;
    }
  }
  }

Use the above function whether the user already signed or not