SAN FRANCISCO--Nokia is at work on a cell phone that uses controversial microchips used to store product information and signal their location, the cell phone maker announced Sunday.So-called radio frequency identification (RFID) is a favorite of warehouse operators and some retailers because of how easy product information stored on the chip can be transferred. Nokia said delivering product information to a mobile device using RFID can extend the technology "beyond the supply chain, and into customer service, merchandizing, marketing and brand management."
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