2025-09-24 00:00:00 CartR App – Unlock Luggage Carts Effortlessly! The CartR app offers a seamless, contactless experience for unlocking luggage carts equipped with sMart Lock™ technology. Simply download the app, create an account, and add your preferred payment method to leave a deposit. Then, scan the QR code on the nearest locked cart, and you’re good to go!