> I would think the cell service providers have much more reliable data. Google tracks location history from GPS and this is accurate to at most a few meters a

> I would think the cell service providers have much more reliable data. Google tracks location history from GPS and this is accurate to at most a few meters and it can be use to check if people walked by each other on the street. As far as I know phone service providers don't have anything similar. The cell you're connected to can cover an entire neighborhood.