When you have to activate a larger number of Blippa QR labels it is kind of clumsy to use the built-in QR scanning in the iPhone. You will have to switch back to the camera app after each activation.
A better way is to use the Cognex barcode app. See Barcode Scanners i App Store
In the app, you can use the “Open URL automatically” setting to open the Blippa activation as soon as the QR code is detected.
And, if you choose “Close” (in the upper left part of your screen) after the activation is completed, you will be back in the scanning.
So, If you need to activate hundreds if QR labels, this is a very good app!