Using PHP form on Android

Hello guys, I'm pretty new in developing for Android via Flash and Air. I was used to using Flash on Actionscript 2.0 so now I'm facing some troubles readapting to the new AS3.

I created an app for both desktop and Android which uses a form sent via PHP. On the desktop it's working OK, but on Android no data is sent.

Here is the code used:

submit_btn.addEventListener(MouseEvent.CLICK, sendMessage);

function sendMessage(e:MouseEvent):void

{

          var my_vars:URLVariables = new URLVariables();

          my_vars.senderName = name_txt.text;

          my_vars.senderEmail = email_txt.text;

          my_vars.senderPhone = phone_txt.text;

          my_vars.senderAge = age_txt.text;

          my_vars.senderParent = parent_txt.text;

          var my_url:URLRequest = new URLRequest("http://www.trendmc.com.br/yazigi/qrcode/mail.php");

          my_url.method = URLRequestMethod.POST;

          my_url.data = my_vars;

          var my_loader:URLLoader = new URLLoader();

          my_loader.dataFormat = URLLoaderDataFormat.VARIABLES;

          my_loader.load(my_url);

          name_txt.text = "";

          email_txt.text = "";

          phone_txt.text = "";

          age_txt.text = "";

          parent_txt.text = "";

          message_txt.text = "Registro efetuado";

          play()

}

Any ideas where is my mistake?