sdk-for-flutter/docs/examples/locale/list-countries-phones.md

import 'package:appwrite/appwrite.dart';

Client client = Client()
    .setEndpoint('https://<REGION>.cloud.appwrite.io/v1') // Your API Endpoint
    .setProject('<YOUR_PROJECT_ID>'); // Your project ID

Locale locale = Locale(client);

PhoneList result = await locale.listCountriesPhones();