“To scan a QR code on your iPhone, all you have to do is open the Camera app and point your phone at the QR code. Make sure the QR code is inside the box on your screen, and then tap the pop-up banner or the yellow QR code icon in the bottom-right corner.”
“If you’re running Android 8 or later, you can scan a QR code by opening the camera app, pointing your phone at the QR code, and tapping the pop-up banner. If you don’t see the pop-up banner, you can use the Google Lens app to scan the QR code instead.”