public function clear()
    {
        $this->clearCountryCode();
        $this->clearNationalNumber();
        $this->clearExtension();
        $this->clearItalianLeadingZero();
        $this->clearNumberOfLeadingZeros();
        $this->clearRawInput();
        $this->clearCountryCodeSource();
        $this->clearPreferredDomesticCarrierCode();
        return $this;
    }