> I thought iOS doesn't do that anymore?

Last I checked, they did because it's part of the actual spec, though if anyone has definitive evidence to the contrary (either for iOS or flagship Android phones), I'd be curious to see it.

You know, I totally forgot this was a thing. I'm sure modern phones do it. Last time I was on an airplane, couple months ago, I was messing around with airmon-ng, and I was amazed at the amount of personally identifiable information that people's WiFi drivers were just spewing into the ether.