code: def number_type(numobj):
      
      region_code = region_code_for_number(numobj)
      metadata = PhoneMetadata.metadata_for_region_or_calling_code(numobj.country_code, region_code)
      if metadata is None:
          return PhoneNumberType.UNKNOWN
      national_number = national_significant_number(numobj)
      return _number_type_helper(national_number, metadata)
docs: Gets the type of a valid phone number.
  
      Arguments:
      numobj -- The PhoneNumber object that we want to know the type of.
  
      Returns the type of the phone number, as a PhoneNumberType value;
      returns PhoneNumberType.UNKNOWN if it is invalid.