Slashdot Mirror
Shopping Centers Track Customers Via Cell Phone Signals
oschobero writes "According an article from the Times, customers in shopping centers are having their every move tracked. Using cellphone signals, the system can tell when people enter the center, how long they stay in a particular shop, and what route each customer takes. The system works by monitoring the signals produced by mobile handsets and then locating the phone by triangulation." The particular tracking device described by the article is made by an English company called Path Intelligence.
No, if you turn it off, it's off.
At least on every phone I've owned.
Gone!
Seriously, The Path Intelligence guys use, or at least got started using, the GNU Radio platform(which, incidentally, is really really cool and you ought to check out). http://www.wired.com/science/discoveries/news/2006/06/70933?currentPage=2 http://photos1.blogger.com/blogger/6124/1637/1600/path_intelligence.jpg http://handcircus.blogspot.com/2006/06/my-brother-in-wired.html
This is pretty cool. The website claims accuracy of 1-2 meters. If they indeed use triangulation, their equipment has to be able to measure time down to ~1/300 millionth of a second. BTW, chances are that tracking is anonymous. I don't believe phones transmit phone numbers or other private information unencrypted.
Since this article is about cell phone tracking, I thought I would mention a free GPS tracking service that we recently launched. It's called InstaMapper. There is a DIY that explains how to track a car in real-time using a $40 prepaid cell phone:
http://www.instamapper.com/diytracking.html
Under Section 5(1)(b) of the WT Act 1949 it is an offence if a person "otherwise than under the authority of a designated person, either:(i) uses any wireless telegraphy apparatus with intent to obtain information as to the contents, sender or addressee of any message whether sent by means of wireless telegraphy or not, of which neither the person using the apparatus nor a person on whose behalf he is acting is an intended recipient;
This means that it is illegal to listen to anything other than general reception transmissions unless you are either a licensed user of the frequencies in question or have been specifically authorized to do so by a designated person. A designated person means:
the Secretary of State;
the Commissioners of Customs and Excise; or
any other person designated for the purpose by regulations made by the Secretary of State.
Or:
(ii) except in the course of legal proceedings or for the purpose of any report thereof, discloses any information as to the contents, sender or addressee of any such message, being information which would not have come to his knowledge but for the use of wireless telegraphy apparatus by him or by another person."
This means that it is also illegal to tell a third party what you have heard.
With certain exceptions, it is an offence under Section 1 of the Regulation of Investigatory Powers Act 2000 for a person - "intentionally and without lawful authority to intercept, at any place in the United Kingdom, any communication in the course of its transmission by means of:
a public postal service; or
a public telecommunication system."
It is similarly an offence to intercept any communication in the course of its transmission by means of a private telecommunication system.
According to Ofcom, scanners and monitoring radios can be legally sold, bought and used in the United Kingdom, without the need to obtain a license, provided they only receive radio services meant for general reception by the public. In the UK such services include Citizens' Band, Amateur, licensed broadcast radio, weather and navigation broadcasts.
It is only illegal to use scanners to listen to licensed private services such as the police and taxi radio transmissions and other prohibited or private broadcasts not intended for the public. Listening in on such broadcasts is an offence under Section 5(1) (b) of the Wireless Telegraphy Act 1949.
In order to help the public understand what it can and cannot listen to, Ofcom publishes a Radio Authority information sheet titled RA-169.
Anyone who intends to listen to radio transmissions should be aware of the following, it warns: A license is not required for a radio receiver as long as it is not capable of transmission according to The Wireless Telegraphy Apparatus (Receivers) (Exemption) Regulations 1989 (SI 1989 No 123). An exception to this is that it is an offense to listen to unlicensed broadcasters (pirate broadcasts) without a license and licenses are not issued for that purpose.
Although it is not illegal to sell, buy or own a scanning or other receiver in the UK, it must only be used to listen to transmissions meant for general reception - Amateur and Citizens' Band transmissions, licensed broadcast radio and weather and navigation broadcasts. It is an offence to use your scanner to listen to any other radio services unless you are authorized by a designated person to do so.
So possession of the equipment is allowed so long as it is not used to listen to prohibited communications in the UK.
http://www.monitoringtimes.com/html/mtlaws_may04.html
They will track you the best, because when the signal quality gets worse, your phone increases its own signal strength in order to keep the connection as long as possible.
The Tao of math: The numbers you can count are not the real numbers.
They intercept the IMEI number of the cell phone; the serial number of the hardware, not your personal telephone number. You could change the telephone number simply by unlocking the phone and inserting a new SIM card. But the IMEI never changes unless you got a new phone.
Like cable broadband networks, the actual data transferred for calls is encrypted, but the IMEI is not.
Vintage computer adverts: http://www.vintageadbrowser.com/computers-and-software-ads
As a fun experiment, try placing your cellphone (turned on) next to an audio receiver, or television, or any other device that is susceptible to radio interference.
What you'll soon see is that the phone is causing interference (through transmissions) intermittently. For example, every few minutes you will hear slight buzzing from the speakers of your radio or television (and if it is a television you might see the picture go wavy, too).
This is a well-known phenomenon, so saying that phones do not broadcast when they are not in use is an error.
However, I'm not sure how this could be used for accurate tracking, since the broadcasts are only intermittent. You could go halfway across the store between broadcasts, which would make it a bit difficult to show your route I'd guess.
The guy didn't have the radio off--the phone was just in sleep mode, where it still polls for e-mail (if you have it set up to do that.)
The Slashdot article linked to http://www.theinquirer.net/en/inquirer/news/2007/09/10/att-is-cruising-for-a-bruising explains it all.