public function getPhonenumber()
    {
        for ($i = 1; $i <= $this->maxPhoneNumber; $i++) {
            if (isset($this->_gemsData['grs_phone_' . $i]) && ! empty($this->_gemsData['grs_phone_' . $i])) {
                return $this->_gemsData['grs_phone_' . $i];
            }
        }

        return null;
    }