Re: [TSCM-L] {2427} Re: cellphone debug

From: Rogelio Villarreal G <rvg..._at_prodigy.net.mx>
Date: Wed, 13 Feb 2008 18:18:53 -0600

For several years the US government has mandated cell phone manufacturers to
install GPS tracking devices in the cell phones to locate people who call
911 in emergency situations and need to be located. However, aside from
government being able obtain information from service providers on location
of phone and service providers have this information to be able to charge
your calls, other equipment exist:

A sample of the true story:



Highly accurate and able to work with any phone, existing or future,

XXXXXXXX U-TDOA (Uplink Time Difference of Arrival) provides the

performance needed for mission critical location-based services.



A high-yield, highly accurate location technology, XXXXXXXX's Uplink Time
Difference of Arrival (U-TDOA), relies upon multilateration, using cell
towers, which makes it especially well suited for indoor and urban
environments. Because it is completely network based (calculating location
based on a normal cellular signal) no additional chip or software needs to
be installed into the handset, which means it can locate every mobile phone
anywhere.

U-TDOA determines a mobile phone's location by comparing the times at which
a cell signal reached multiple Location Measurement Units (LMUs) installed
at the operator's base stations. Accuracy is determined by the network
layout and deployment density of LMUs to Base Transceiver Stations (BTSs).

U-TDOA technology works very well in urban, suburban and indoor
environments-suffering only in extreme rural conditions where the cell sites
are arranged in a "string of pearls" configuration. In such scenarios,
XXXXXXXX can supplement its U-TDOA technology with Angle of Arrival (AOA)
technology,

which computes locations based on the angle at which signal reached two base
stations.



Additionally cellular intercept equipment for GSM A5.1 are active versus GSM
A5.2 which are passive. These units can not only track your location with
support of DF equipment, but also practically manipulate and control all of
your functions such as intercept in coming calls, out going calls, SMS
messages and block your phone for no in or out calls. This equipment tells
the user which cell you're in (Cell ID) and the approximate distance to the
BTS (Base Station).



So it may be safer to use smoke signals than a cell phone if you do not want
to give away your location and information.}}



Best Wishes



Rogelio

Mexico

----- Original Message -----
From: "Richard Anderson" <ric..._at_commonbondassociation.org>
To: <TSCM-..._at_googlegroups.com>
Sent: Tuesday, February 12, 2008 12:10 PM
Subject: [TSCM-L] {2427} Re: cellphone debug


>
> In regard to GPS in cellphones I doubt it would be necessary to have an
> actual GPS unit as a cell phone can easily be located by triangulated
> signal
> strength between receivers in cells. Cell phones send out regular network
> registration signals as long as they are turned on. This is the signal I
> have been using to detect hidden cell phones. A unit in actual use can be
> pinpointed almost instantly, but one that is not in use but turned on,
> takes
> a little patience and finesse. I am using a very small handheld RF
> detector
> which seems to work well with the possible exception of Kyocera cell
> phones.
> For some odd reason, they trigger the detector but the closer I get to the
> unit, the signal seems to disappear.
>
> Richard Anderson
>
>
>
>
> >
Received on Sat Mar 02 2024 - 00:57:25 CST