You can check if your iOS device has a built-in QR code scanner by opening your camera, scanning it at the code, and waiting up to three seconds. If nothing happens, search for QR code scanning in your device’s settings, then point the camera at the code again. If you see that nothing happens after this second step, either, then it means your device does not have a built-in QR code scanner, and you will have to download one from the Apple Play Store.