The phone thing interests me. At my old job we used barcodes but needed to buy pretty expensive hardware to be able to scan and assign locations to each code. With the cell phone apps can you keep track of QR codes that are locations, and where each item has been scanned to? That would be a significantly less expensive set up for a warehouse that was just getting started.

to clarify, at my old job you would take a scanner and scan the barcode on the shelf you are at, and then scan all of the barcodes on the items on that shelf. Then the computer system would update and show all of the current locations for the items you just scanned. Is something like that possible with QR codes and phones?