If you need an app to quickly create and save (or share) a QR code, take a look of QR Creator:
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Download: QR Creator | Windows Phone Apps+Games Store
QR (of course) for the download url:
The app is designed to be as simple as possible, in order to create and use your QR very quickly.
It is also designed to be good-looking, but I let this quality be judged by you
If you have any suggestion, or any feedback, don't hesitate to contact me! Thanks!