public function init()
    {
        $libPhoneNumber = PhoneNumberUtil::getInstance();
        $optionsList    = [];

        foreach ($libPhoneNumber->getSupportedRegions() as $code) {
            $fullTextCountry = \Locale::getDisplayRegion('en_' . $code, 'en');
            $optionsList[$code] = $fullTextCountry;
        }

        asort($optionsList);

        $this->setValueOptions($optionsList);
    }