<br><br><div><span class="gmail_quote">On 11/25/07, <b class="gmail_sendername">Wolfgang S. Rupprecht</b> <<a href="mailto:email@example.com">firstname.lastname@example.org</a>> wrote:</span>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><snip> <br></blockquote><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Can people ever be compelled to supply<br>truthful GPS information to LEO as long as open source cellphones are<br>legal? <br></blockquote></div><br>OK, legal matters aside, your network operators ALWAYS know where your phone is: cell towers can triangulate the position of your phone(it's like reverse GPS... multiple receivers on a single source). Most of the phone navigation, at least here in the US uses this technology... not GPS. Which firmware the phone runs is a non-issue.. they don't ask you they ask for that data. Technically the only way to prevent this is to not transmit. It is technically possible to re-write the GSMD to power down the GSM module unless you are placing a call (You'd still be traceable whilst actually placing a call, but not traceable otherwise) the downside is, you wouldn't be able to receive calls.
<br><br>Stopping the cell towers from tracing you wouldn't help either: It would be possible to set up an alternate antenna farm that decodes enough of the GSM signal to identify the transmitter.<br><br>Pretty much at this point you should be realizing that there are only two possible ways to fix this: one is the legal things we're not talking about, because that's not my area of expertise (besides, I'm not sure how effective it would be), the other is to stop using any kind of transmitting device... technically anything that uses electricity.
<br clear="all"><br>-- <br>Jeff<br>O|||||||O