code: def fetch(self, end=values.unset, start=values.unset):
          
          params = values.of({'End': end, 'Start': start, })
  
          payload = self._version.fetch(
              'GET',
              self._uri,
              params=params,
          )
  
          return UsageInstance(self._version, payload, sim_sid=self._solution['sim_sid'], )
docs: Fetch a UsageInstance
  
          :param unicode end: The end
          :param unicode start: The start
  
          :returns: Fetched UsageInstance
          :rtype: twilio.rest.preview.wireless.sim.usage.UsageInstance