Itch3: Anti-lost/theft protection

Marcel de Jong mdejong at
Mon Mar 5 00:15:55 CET 2007

On 3/4/07, t3st3r <t3st3r at> wrote:
> FYI: just to let you know, an anti-thief\anti-lost system for phones
> already exists.Here is the story.Maybe someone already heard that
> proprietary Siemens mobile phones (x55 series based on 80C166 CPU and
> x65 and x75 series based on ARM9) were reverse-engineered deeply and
> people has bypassed boot loader protection (preventing user's code from
> being uploaded) so everyone can run it's own code on phone's CPU.Also I
> heard some other vendors were hacked successfully as well.Some
> SonyEricsson for example.
> One of the first firmware patches has been the anti-thief subsystem.How
> does it works?It does detects SIM card change (by IMSI checking IIRC)
> and then SMSes to predefined number(s) (should be someone of your family
> or friends of course).This reveals new phone number (allowing to take a
> legal actions) and can allow owner to regain remote control, get
> coordinates (actually, on Siemens phones you can get Cell ID at very
> most, funny enough anyway).

But how does this affect resale of the device? Because then the new
owner inserts a new SIMcard, and then this mechanism would go active,
wouldn't it?
I'm just curious, it sounds like an interesting idea.


Marcel de Jong

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