要实现发送飞信的免费短信，你必须是中国移动的手机用户，并且开通了飞信功能。可以通过这个源码修改几个参数放到服务器，就可以实现在网站发短信功能。-To achieve a free SMS to send the letter to fly, you must be a Chinese mobile phone users, and opened a flying letter function. You can modify several parameters of this source code into the server, you can send text messages on the site features.