Just think of Santa. He knows when you are sleeping. He knows when you're awake. He knows if you've been bad or good, for goodness' sake. And he knows these things all the time, even though you can't see him. As Scott McNealy, CEO of Sun Microsystems, starkly told reporters in 1999, "You already have zero privacy. Get over it."
Big Brother Logs On , MIT Technology Review, September 2001

Does this mean that location-sensing technology can never be used to find or track people without their express consent? Probably not.
GPS / Cellular Provider, 2002

Under the E911 mandate, carriers could track phones embedded with GPS chips, even when they aren't turned on.
Wired Magazine, Sept 20, 2001

A study from Gartner titled "Eavesdropping on the Device in Your Pocket" argues that the number of wireless-device types that include transmitting capabilities is quickly expanding beyond mobile phones, handheld computers, and pagers, to toys, cameras, consumer audio devices, digital radios, and medical tracking devices.

The report also concludes, however, that new kinds of privacy issues will be raised by these trends. "Average citizens are likely to be unaware of the amount of information that could potentially be gleaned by monitoring the devices they carry,” says the report."
Pocket Privacy Concerns, April 2002, By Sebastian Rupley