AT&T keeps emailing me about my 4G trial expiration. Honestly had no idea I even had it and no one at the dealership mentioned it when I bough the car.

I'm just curious - what is the 4G data used for?

There is an in-car Wi-Fi hotspot that uses it. I believe that's what this would be referring to. I remember getting similar emails last year about my car.

Oh, interesting. I wonder how relevant Lexus and AT&T think this is in an age of cell phones and personal hotspots. Guess I'm saving myself $20 a month :-)