For example, I could easily count up each scrambled phone number’s GPS pings at 1:00 a.and 6:00 a.every day. From that exercise, I’d know where each scrambled phone number is located through the night (most of us sleep in our houses with our phones). Then, via the location I discovered for a specific phone, I can associate its scrambled phone number to an address and presumably a person.
Link: How COVID-19 is changing the way we think about privacy
via www.fastcompany.com