public function getType($asConstant = false)
    {
        $type = $this->lib->getNumberType($this->getPhoneNumberInstance());

        if ($asConstant) {
            return $type;
        }

        $stringType = Arr::get(static::parseTypesAsStrings($type), 0);

        return $stringType ? strtolower($stringType) : null;
    }