To scan a QR code simply open the app, point the camera at the code, and you’re done! There is no need to take a photo or press a button. QR Code Reader will automatically recognize any QR code your camera is pointing at.  It's that simple.....

How do you scan a QR code?

Barcode Scanner & QR Scanner is completely free. Change your smartphone into a powerful QR Code, Barcode, and Data Matrix scanning utility. Open the app, point the camera at the code and you’re done! By using the phone’s camera, Barcode Scanner will quickly scan and recognize the information of barcode.
 
You’ll need an app that can read QR codes (we like Barcode Reader or Google Goggles in the Android Market). When you see a QR code in an app review, hit it with the barcode reader and it will take you to the download section in the Android Market. It’s that simple. Go ahead and try it on the code above.
 
What is the app that scans the squares?
To download the free app QR Code Reader and Scanner by ShopSavvy, Inc., get iTunes now. QR Code Reader and Scanner. , Inc. Scans both QR codes and barcodes.

QR Code Reader and Scanner on the App Store on iTunes – Apple

 

Using Android and QR codes | Android Central

m.androidcentral.com/using-android-and-qrcodes
 
What do you call those square barcodes?
Those funny looking square barcodes are called QR codes. QR stands for ‘quick response’ and they will revolutionize how marketers convert prospects into customers. QR codes are scanned by smart phones. Visit: http://get.beetagg.com in your mobile browser and automatically downloadQR Code reader software.