Nokia is working on putting RFID tags into its cell phones. These tiny, passive radio frequency identity chips would include a unique phone code that could not be changed. The information on a RFID tag can be checked with a reader device.

Tagging the phones will give Nokia several advantages. Hackers have devised ways to unlock the phone ID so they cannot be traced and locked out after theft. The tag can also include permanent information about the manufacturing origin and version of the phone.