Australia's Westfield already use this technology to track smartphones at three shopping centres. ''Westfield is capable of using the MAC identifier system in its centres, but cannot collect any data other than to know smart phones are moving within,'' a company spokeswoman said.
Westfield offers free internet access in three centres across Sydney, Brisbane and Melbourne. Visitors can opt into the service, but Westfield can also monitor the movements of smartphones even without the owners logging in to its Wi-Fi network.
