protected function checkBrowserNokia()
    {
        if ($this->containString($this->_agent, array('Nokia5800', 'Nokia5530', 'Nokia5230'), true, false)) {
            $this->setBrowser(self::BROWSER_NOKIA);
            $this->setVersion('7.0');
            $this->setMobile(true);
            $this->setRobot(false);

            return true;
        }

        if ($this->checkSimpleBrowserUA(array('NokiaBrowser', 'BrowserNG', 'Series60', 'S60', 'S40OviBrowser'), $this->_agent, self::BROWSER_NOKIA, true)) {
            return true;
        }

        return false;
    }