It may be possible that your hosting provider is blocking external file access. In such events you should use cURL Script. Copy and past-able script is provided in http://textit.biz/curl_scripts.php
Textit.biz
Sri Lanka's Pioneer SMS Gateway
It may be possible that your hosting provider is blocking external file access. In such events you should use cURL Script. Copy and past-able script is provided in http://textit.biz/curl_scripts.php