You just use your smartphone to scan the QR code and you will be directed to my blog in mobile version. For sure, your smartphone is subscribed with data package or is connected to internet via Wi-Fi.
Wish to add in one for your blog? Visit http://qrcode.kaywa.com/ and get one for free.
Your smartphone doesn't have QR Code scanner? Download it via Google Play Store (Android) or App Store (iPhone) at your smartphone.
You can search for QR code Scanner with the Search function. There are many QR code scanner apps in the store and download any one of them will do.