Just to expand on the phone thing because it amuses me:
In a past life myself and a few others had access to cell tower records for a specific company. As a research project, we applied what we would now call AI/ML concepts to sanitized data (basically all customer IDs were mapped to a different ID set and then the mapping was thrown away).
For poops and giggles I checked the tower nearest the local happy ending massage place. And, lo and behold, we were able to immediately get a list of everyone who turned their phone off for 30-60 minutes.
Just to expand on the phone thing because it amuses me:
In a past life myself and a few others had access to cell tower records for a specific company. As a research project, we applied what we would now call AI/ML concepts to sanitized data (basically all customer IDs were mapped to a different ID set and then the mapping was thrown away).
For poops and giggles I checked the tower nearest the local happy ending massage place. And, lo and behold, we were able to immediately get a list of everyone who turned their phone off for 30-60 minutes.