What if every store had a bar-code sticker on its window so that you could pull out your iPhone, wave it in front of the bar code and get all sorts of information about that business—the telephone ...

Q: I’ve just bought a new C-Class and there is a funny barcode under the fuel flap. What is this – have I won something? A: That is called a QR code and Mercedes-Benz is using them to help provide ...