Anyone know how to make one of these things? It could be useful for seeing if anyone is lurking outside of your house like that "creepy stalker ex boyfriend"
http://online.wsj.com/article/SB1000...723197574.html
could I hack an old cell phone and or signal generator to do this?

thanks

Deleted. My bad.....

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I think you misunderstand what I am asking. I'm not condoning hacking someone else's phone. I simply wondered if there was a way to make my phone detect if another phone is is in close proximity, like the stingray does. Apparently this a perfectly legal thing to do. It has nothing to do with stealing information or wire tapping.

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To the first, I was going to answer 'no', but I realise that the correct answer is 'not with a sensibly finite level of difficulty, or, practically, taking advantage of any of the parts of the phone'. If you mean 'can I spend the next few years studying the phone and what it does and will it enable me to understand the problem that this device solves in more detail and therefore have a small part of the technology needed to perform this task' then the answer would be yes.


The answer to the second is genuinely no, from all practical standpoints. A signal generator is hardly a better starting point than a bucket.

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It looks like shopping malls everywhere will be tracking cell phones now.

http://money.cnn.com/2011/11/22/tech...ey_mostpopular

Not a signal benerator. What you need is a scanner radio receiver working on the 3g and 4g bands with perhaps a high gain directional antenna.

I found this from a Pop-Sci magazine article about a flying cell phone hacker:
"The entire Universal Software Radio Peripheral (USRP) design is open source, including schematics, firmware, drivers, and even the FPGA and daughterboard designs.
When combined with the open source GNU Radio software, you
get a completely open software radio system enabling host-based
signal processing on commodity platforms. No software or licenses
need to be purchased. It provides a complete development
environment to create your own radios."
You can buy daughterboards for the cell phone range, however it is too expensive for me!
http://www.ettus.com/products