'Fetch a UsageInstance
:param unicode end: The end
:param unicode start: The start
:returns: Fetched UsageInstance
:rtype: twilio.rest.preview.wireless.sim.usage.UsageInstance'

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'])
