[sacnoradhq]

Interesting.

Are we talking 1. app level, 2. os-app level, and/or 3. phone carrier level?

There is/was an ability to track the location of any non-US cellphone through shady data broker websites that allowed collection of carrier-to-carrier metadata such as current location to be purchased by anyone. This ability was not allowed in the US.

So what has changed about collection and resale of US-based location data since then? Is there evidence carriers are actively selling data?

Edit: Also, what about non-mobile device location data from other sources such as laptops, desktops, tablets, and other consumer electronics?