RFID-Enabled Phones Could Let Credit Card Companies Track Users

"An Ericsson executive says all new mobile phones sold in 2010 will include an RFID chip that will allow owners to open their car or house door with their phone. A handy feature, no doubt, for some people. But the executive says the chip might also be used by credit card companies to track the location of cardholders to cut down on fraud."

http://www.wired.com/threatlevel/2009/06/rfid-enabled-phones-would-let-credit-card-companies-track-users/