Re: Cell phones


default wrote:


NB: This is regarding GSM/UMTS networks. Others maybe different.


With today's phones they don't have to triangulate anything -

Triangulation is effectively what is done with GPS, it gets location based on (at least 3)
GPS satellites.

If you mean DF triangulation, then I don't think thats needed anymore.

the cell
phone uses GPS (required by law) to transmit its position with great
accuracy in three dimensions.

what country and what mobile phone technology are you talking about? please supply
a weblink.

Utter nonsense. There's no such law in any country I'm aware of, least of
all the US. The 911 system can *use* data from GPS capable phones to
pinpoint you, but if you don't have one of those expensive toys the best
they can do is use info from the cell tower you're connecting to, which
gives them a rough idea of distance from the tower and general direction
(sometimes).

You have no idea, do you? I'm not really surprised, but I am
surprised that you didn't do some basic research before you posted. I
post to electronics design groups and many of them didn't have a clue
that GPS is mandated in cell phones.

there is no such law in any european country i know of, where public
mobile phone networks are based on 3gpp gsm & utms technologies.

I work in cellphone network industry in europe, and without any gps, it is
possible to locate a subscriber (in a city) to within approx. 500m-1km (more accurate
with higher density of cells)

using LAC/RACs this will give locations of the device.
http://en.wikipedia.org/wiki/Mobility_management#Location_update_procedure

The TV show seems to want people to believe that the phone has to be
turned on to give up its position. That isn't necessarily so. The

Please. Have a trained technician take a look at your foil beanie. It
appears to be leaking badly.

with regards having a mobile telephone being "on" to locate it, this is true.

even when some devices (namely motorola devices) "for user interaction" are turned off
the network related circuitry is still active, making it possible to find the location of that device.

bottom line, if you don't want to be "tracked" (whatever meaning you want to give it), don't carry a mobile phone.

.

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