Fix SMS sending script

I build this code here: But I am new in PHP why do not the message sends? I cutted out the username and password and domain. <?php $messages = $_POST['message']; $number = $_POST['number']; $url = "[login to view URL]$number&message=$messages"; ?> <div class="well"> <h4>SMS</h4> <form action="" method="post"> <input type="text" name="number" class="span5 input-medium" style="width:75%;" placeholder="Number" tabindex="1" /> <textarea placeholder="Messages....." rows="4" name="messages"></textarea> <br /> <input class="btn btn-primary" type="submit" name="submit" value="Send" tabindex="3" /> </form> </div>