Send a request to the device to trigger 'lost mode'.

        The device will show the message in `text`, and if a number has
        been passed, then the person holding the device can call
        the number without entering the passcode.

def lost_device(
        self, number,
        text='This iPhone has been lost. Please call me.',
        newpasscode=""
    ):
        """ Send a request to the device to trigger 'lost mode'.

        The device will show the message in `text`, and if a number has
        been passed, then the person holding the device can call
        the number without entering the passcode.
        """
        data = json.dumps({
            'text': text,
            'userText': True,
            'ownerNbr': number,
            'lostModeEnabled': True,
            'trackingEnabled': True,
            'device': self.content['id'],
            'passcode': newpasscode
        })
        self.session.post(
            self.lost_url,
            params=self.params,
            data=data
        )