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Re:A man using Google ad data to help heroin users by texasbigdata on Monday December 09, 2019 @10:55AM (#21743649)
I've used call rail before. They don't IIRC. I believe he's using the IP (from Google?) since he says "Yet Callrail still withholds your IP address (exact location) from us.". So it seems he's taking 1) Your IP, 2) Your Phone Number and 3) matching your phone number to your name (I don't think call rail does this natively, unless you have a CRM).

I'm not a Call Rail expert, but couldn't you do this with a pixel or alternative measure? Like really you're baiting them into calling you, then layering on the IP of their device to triangulate where they likely are.

Re:A man using Google ad data to help heroin users by mrandish on Monday December 09, 2019 @12:19PM (#21744367)
There are data brokers who claim to turn a phone number into a billing address zip code probably relinking via some credit card company or bank selling "anonymized" data.