QR code on the modem is just to setup the surfboard central app to access the modem settings but you can also download the app from play store or the app store. You can also access the modem settings by following the steps mentioned on the below article. If still the QR label is needed by your service provider, you need to check with the place of purchase.

http://arris.force.com/consumers/articles/General_FAQs/SBG6700-AC-Web-Manager-Access