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You can point the builtin Camera app on iOS to any QR code, it will pick it up just fine.

Same with Android

On iOS, you can use the Camera app on your iPhone or enable the Code Scanner button on the Control Panel: https://support.apple.com/en-ca/guide/iphone/iphe8bda8762/io...

It would be interesting if Apple added support articles or how-to videos for built-in features to their App Store search results though…

Try your plain camera... this seems like such a hidden anti-feature though... no one I know has tried just the camera

I discovered this week when fooling around with QR code makers that the Android camera app, at least the one released on Samsung phones, does not read QR codes. That was very surprising to me.