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Today it is clear that the most widely used device in the world is the mobile phone. Phones are mostly voice-centric devices, but a wide range of mobile devices now exist on the market offering multiple services and functions. The term smartphone is now used to characterize a mobile phone with special computer-enabled features. Despite the mobile phone evolution, one of the main disadvantages of these devices is that they still have insufficient input capabilities, providing tiny keyboards to do manual entries. Fortunately most smartphones are now equipped with several sensors that can be used to enhance and create new users interfaces. This is the case for integrated cameras that can be used to read visual codes, like Quick Response (QR) Code as well as other sensing technologies such as Radio Frequency Identification (RFID) and the associated Near Field Communications (NFC). The use of these technologies does not only facilitate entering information, but it also allows using mobile phones for interactions with people, places and things, enhancing the usability and usefulness of these devices. The use of QR Codes and RFID tags has significantly evolve in the last decades, they were first used to track products in the industry, but now they have contributed to develop several new concepts that integrate the physical world with the virtual one.

Using RFID/NFC and QR-Code in Mobile Phones to Link the Physical and the Digital World