[amitbr]

The blog is trying to mask wifi probe requests. Active scan and connect modes are disabled on iOS and most modern smartphones from my knowledge. Back in the golden days, we use to track people around based on their wifi signals, we also developed a machine learning system to determine where a person was based on their RSSI over time (we used time warping networks).

[javl]

I believe recent versions of IOS still do this in some form, but they use random MAC addresses. But even if recent devices don't send out probe requests anymore, there are still many older devices or devices with out-of-date OSes to make this work.

While testing I didn't really have a way see what percentage of devices around me sent probe request, but the absolute amount of devices is still high.