QR code reader hidden in iOS 11 Safari app
In iOS 11 the Safari app can now read QR codes!
(In addition to the Camera App).
Just browse to a page with a QR code on it and hold you finger down on the image like your going to "Save Image" and if it recognizes the code it will provide an appropriate action to take base on the QR code type.
iPhone 6 Plus, iOS 11.0.1