Just signed up for OnStar WiFi hotspot promo. 3 GB or 3 months whichever comes first.
What is the rate if I go over ?
I will probably continue with the Hotspot feature only.
OnStar service ends Dec 31 2020 though.
It depends on whatever your contract says. (The details are often different, depending on what that week's special was, or how long you ignore them before signing up, or the phases of the moon, or ...)
What is the throughput using the car as a WiFi hotspot (the upload / download speeds) ?