It is shown in the video that the turnstile scans a QR code presented in the screen of the app. So if that's the only interaction (no idea!) it seems that the p

It is shown in the video that the turnstile scans a QR code presented in the screen of the app. So if that's the only interaction (no idea!) it seems that the phone could be replaced by an NFC card or similar "dumb" device.