Verizon Wireless literally has a tracking program (they call it "Precision Marketing Insights") that runs on their cell network for all devices unless you go to

Verizon Wireless literally has a tracking program (they call it "Precision Marketing Insights") that runs on their cell network for all devices unless you go to a hidden page and explicitly opt-out. And it tracks separate profiles per-phone-line. They do more than supercookies.