So I’ve just been thinking about privacy, and how everyone’s location can be tracked. Then I realized: What about people who have no permission to enter the country?
Like do they just decide to not have a phone, or do they still have phones and just roll the dice and hope they don’t get caught?
You don’t talk to US customs on your way out via land borders.
If you fly out, there would be a flight record, but most of the other methods don’t get recorded. If you go to Canada, the canadian immigration shares that data with the US, assuming you use the same passport (some people have more than one)
If you go to Mexico though, there’s no record and the Mexican government doesn’t share that info with the US. https://crsreports.congress.gov/product/pdf/R/R47541 Page 14