On Tue, 4 May 2021 12:20:16 +0000 (UTC) m d <mdreplican...@yahoo.com> wrote:
> ##It's rather related to the cellular network architecture: you are > ##connected to a given antenna / base station that knows at what > distance ##of it you are. In addition you might move so there is a > feature ##called handover that enables you to switch form one base > station to the ##next one while moving. So you then have multiple > base stations that ##knows the distance between you and them. With > that it's trivial to get ##your position. > > OK, is that distance known to the network via the RSSI? > I think this handover feature might be somewhat related to this > "triangulation" method, in which case what if the device remains > static from within a building next to a window. Is it possible that > the station could only connect to 1 base without providing distance > information between the other ones? I'm not an expert on that, as I lack low level knowledge on the standards like GSM, GPRS, 3G, etc. If I recall well, the device sends distance measurements, but it's not magic either as you probably cannot fake the distance too much else it would probably stop working. > ##I'm also unsure if there are more ways than the IMEI to identify > ##devices. It's for instance possible to identify the family of WiFi > ##chips being used just by looking at what is being transmitted. So it > ##may be possible to still get some identifying information out of the > ##device even if the IMEI has been changed. > > Radio fingerprinting pointed above? Yes, I wasn't aware of any papers for GSM. Thanks for the link, I'll try to find the time to read it. > One more thing, is the function to hide caller ID one of proprietary > software? I'm unable to hide my caller ID on Replicant although the > function was working as expected with proprietary ROMS. That's probably because it's not implemented yet. There is some rough information on what is implemented and what is not here: https://redmine.replicant.us/projects/replicant/wiki/Libsamsung-ril That list doesn't take into account the libsamsung-ipc part and how things are implemented, so it's not very reliable but it still gives a rough idea of the status. Having a complete implementation could also enable projects like LineageOS to reuse libsamsung-ipc and libsamsung-ril. This could then benefit the GNU/Linux distributions that use vendor kernels too (or even upstream kernel once we make it work with that). Denis.
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