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Re:iOS 8 randomises the MAC address while scanning for WiFi ... by praseodym on Sunday June 08, 2014 @05:51PM (#7866035)
By making sure your steel-reinforced concrete mall walls are thick enough to block proper 3G/4G reception (no, really, reception is pretty bad in a lot of indoor places).

But still, I agree, it would be very hard to have everyone connect to your wifi.

Re:iOS 8 randomises the MAC address while scanning for WiFi ... by notatoad on Sunday June 08, 2014 @08:01PM (#7866391)
it's hard to get everybody, but it's easy to get a significant sample. just set up an open network called Starbucks WiFi and watch all the iPhones connect to it