Car companies are preparing to sell driver data to the highest bidder

> "On Tuesday, Chetan Sharma Consulting revealed that 2017 saw more new cars added to cellular networks than new cell phones. In particular, it noted that AT&T has been adding a million or more new cars to its network each quarter for the last 11 quarters."

I need some insight here... do any of you have a separate wireless connection for your car? Do you pay for it as a separate line on your cell carrier? What is the purpose of having a dedicated connection for your vehicle?