Are NFC enabled 'phones both NFC devices and NFC readers or just NFC readers?
If they start adding RFID tags to 'phones, the only safe way to not be tracked will be not to carry the 'phone.
If they start adding RFID tags to 'phones, the only safe way to not be tracked will be not to carry the 'phone.
Other "near field" devices have, such as payment cards and passpoets, have been successfulyy communicated with or exploited using directional antennas from further away than you might think.