You can send SMS through, HTTPPOST.
See below Code
xmlhttp = create oleobject
result = xmlhttp.ConnectToNewObject("MSXML2.ServerXMLHTTP")
xmlhttp.Open("POST", "http://www.24x.com/sendsms/sendsms.aspx", False)
xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded")...