More and more shopping centers and councils around Australia are already doing it - working out where people are going and how they get there.
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Companies can track phones by scanning for WiFi signals
or by intercepting mobile phone network signals. (ABC News: Simon Brown)
There are two different approaches to tracking the phones. The Inhouse Group system scans WiFi signals given off by smartphones to pinpoint a customer's location.
Another product from the UK - FootPath by Path Intelligence - intercepts mobile phone network signals.
Neither is able to access any content stored on your phone. (more)