code: def fetch(self, origination_number=values.unset):
          
          params = values.of({'OriginationNumber': origination_number, })
  
          payload = self._version.fetch(
              'GET',
              self._uri,
              params=params,
          )
  
          return NumberInstance(
              self._version,
              payload,
              destination_number=self._solution['destination_number'],
          )
docs: Fetch a NumberInstance
  
          :param unicode origination_number: The origination number for which to fetch pricing information
  
          :returns: Fetched NumberInstance
          :rtype: twilio.rest.pricing.v2.voice.number.NumberInstance