code: public void sms_sendResponse(Integer userId, CharSequence response, Integer mobileSessionId)
      throws FacebookException, IOException {
      this.callMethod(FacebookMethod.SMS_SEND_MESSAGE,
                      new Pair<String, CharSequence>("uid", userId.toString()),
                      new Pair<String, CharSequence>("message", response),
                      new Pair<String, CharSequence>("session_id", mobileSessionId.toString()));
    }
docs: Sends a message via SMS to the user identified by <code>userId</code> in response
  to a user query associated with <code>mobileSessionId</code>.
  
  @param userId a user ID
  @param response the message to be sent via SMS
  @param mobileSessionId the mobile session
  @throws FacebookException in case of error
  @throws IOException
  @see FacebookExtendedPerm#SMS
  @see <a href="http://wiki.developers.facebook.com/index.php/Mobile#Application_generated_messages">
  Developers Wiki: Mobile: Application Generated Messages</a>
  @see <a href="http://wiki.developers.facebook.com/index.php/Mobile#Workflow">
  Developers Wiki: Mobile: Workflow</a>