Plosson pointed out the website of Path Intelligence.

This UK-based company uses mobile signals to track traffic in shopping centers. Path Intelligence first application allows shopping-center owners to see what shop windows are most popular, and where people tend to congregate or avoid.

Technical stuff: Listening for the control-channel signals of mobile phones allows the PathIntelligence setup to pinpoint the location of a phone using triangulation by measuring the difference in time it takes for the signal from a phone to get to multiple antennas.

A demo is available right here.

Besides some questions that you might ask about privacy (as plosson says, they don’t used any personal info, they just track each signal), this is really cool stuffs. Imagine all the info you can get to improve your process, location or else.

Click for a larger snapshot