SMS SOAP Web Service

I have my own SMS sending code in PHP SOAP Web Service as you see below:

       <?php

    try {
    $webservice = new SoapClient("https://services.tvest.net.br:62003/sys/wsdl", array("trace" => 1, "login" => "blabla", "password" =>                                                               
     "blablabla"));
   } catch (Exception $e) {
   print_r($e);
  exit;
  }


   $webservice->enviarSMS("5522998318901", "teste");

     ?>

The question is: how do I start a PHP login confirmation by SMS from this code, I'm having difficulties !!!