code: def _proxy(self):
          
          if self._context is None:
              self._context = DeviceContext(
                  self._version,
                  fleet_sid=self._solution['fleet_sid'],
                  sid=self._solution['sid'],
              )
          return self._context
docs: Generate an instance context for the instance, the context is capable of
          performing various actions.  All instance actions are proxied to the context
  
          :returns: DeviceContext for this DeviceInstance
          :rtype: twilio.rest.preview.deployed_devices.fleet.device.DeviceContext