From the “Japanese Mobile Phone Culture” wiki:
There is a popular trend in Japan to use the mobile phone handset to read information from special barcodes. The phone handset can scan the barcode and then take actions based on the type of content. All over Japan there are posters with the codes and in magazines and business cards. The code usually has links to a web site address or email address that the phone can access, or it might contain address and telephone numbers.
Sony has been spearheading the mobile phone wallet technology…there are many locations such as convenience stores which allow users to pay for goods using their phones; some vending machines even accept phone payments.
Services where the user holds the phone up to a source of music (such as a speaker), and, by dialing a certain phone number, the song is found in a database and identified. The user receives the song’s title, artist, and album within seconds.
