The QR Code provided in he package doesn't work at all... I know I can skip it in the Google cardboard app, but is not well calibrated and I see the image twice when I try to use the headset. It doesn't work.
There might be several reasons why this doesn't work. It might be your phone or the optics of the glasses that doesn't work properly. You may however try the default QR-code provided in this link: http://www.hypergridbusiness.com/faq/vr-headset-qr-codes/ (scroll down to Clas Ohlson Cardboard VR viewer).