code: def fetch(self, origination_number=values.unset):
          
          return self._proxy.fetch(origination_number=origination_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