If you haven't seen OnStar's TV advertisements your TV must be turned off, they seem to run like every other commercial. I am so happy to see how our tax dollars are spent these days, won't go there now though.
If you want to be able to control several of your cars (most cars 1996 or newer) features remotely, you should check out the Mavizon AutoBot system. Download the AutoBot App and plug in their gadget to your cars OBDII data port.
Some of the Mavizon AutoBot features include the ability to locate your car if you forgot where you parked it, have it alert you when your teenagers car leaves a preset boundary, understand what your check engine light is "really" telling you, and send an alert when you are in a car accident.