Cops' Warrantless Cell Phone Tracking Now Better Than GPS 147
Sparrowvsrevolution writes "On Thursday, the House Judiciary Committee held a hearing to discuss a proposed bill to limit location tracking of electronic devices without a warrant — what it's calling the Geolocational Privacy and Surveillance Act, or the GPS Act. Ahead of that hearing, University of Pennsylvania computer science professor Matt Blaze submitted written testimony (PDF) telling Congress that phone carriers, as well as the law enforcement agencies with which they share data, can now use phones' proximity to cell towers and other sources of cellular data to track their location as precisely or even more precisely than they can with global positioning satellites. Thanks to the growing density of cell towers and the proliferation of devices like picocells and femtocells that transmit cell signals indoors, even GPS-less phones can be tracked with a high degree of precision and can offer data that GPS can't, like the location of someone inside a building or what floor they're on. With the GPS Act, Congress is considering expanding the ban on warrantless tracking of cars with GPS devices that the Supreme Court decided on in January. Blaze's testimony suggests they need to include non-GPS tracking of cell phones in that ban, a measure law enforcement agencies are strongly resisting."
Re:This just isn't right... in any way (Score:2, Interesting)
If you're not a criminal, or an "unwanted race" under some future tyranny state, what does it matter that the government tracks your phone? Besides you can disappear quite easily by just pulling the battery.
The facebook issue is more seriously, but when you publish things publicly, whether it's the new facebook or the old newspaper, the government can and will collect that data. Solution: Keep quiet.
Re:Not always more accurate (Score:5, Interesting)
Your cell phone pings at least three cell tower (if just at range) and selects strongest one of them.
And even that your cell phone does not connect to cell, it does not mean cell have not received its signal. Cell phone simply rejects the connection either knowing it can not boost signal so it is too weak or it is just so weak that even max boost it can not hold the stable enough connection to cell.
At country land GPS is more accurate (few meters at starts but even few centimers at longer time when holding at same position, depending how accurate the clock is in device) but even with cell towers (if you just get at least three or two longer time) you can get location few tens of meters or even the estimation of the area where you can be.
GPS is great for the user. As user is the one who gets positioning as well, not just carrier. So user can give that location information to services trough data connection to get more nice features from the phone.
But really, phone without GPS doesn't mean you can not be tracked.
That is one reason why no one at battlefield is allowed to carry a own cellphone because at electronic warfare, such device is bright like a smoke grenade at daylight. Every device emmiting signal can be detected and pinpointed its location.