https://security.stackexchange.com/questions/62124/phones-broadcast-the-ssids-of-all-networks-they-have-ever-connected-to-how-can
I think the lady said they know the IP address of every phone but that doesnt make much sense. anyway, the point was that theyre using the signals from your phone to uniquely identify you. you can simply turn those radios in your phone off when youre not using them.
They used cromulent wrong, unless their day was an acceptable fuckcrustable.