code: def fetch(self, end=values.unset, start=values.unset):
          
          return self._proxy.fetch(end=end, start=start, )
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