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There's a startup in Palo Alto that uses phone signals to track consumers and generate analytics. Perhaps their technology is being used. http://euclidelements.com/

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Interesting. Euclid only works with smartphones, in that it appears to simply sniff MAC addresses, and triangulate them with off-the-shelf wi-fi equipment.

I'm guessing the mall tracking systems are using something on the GSM and CDMA spectra, and are sniffing UDIDs?

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