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