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First generation OnStar units used a 5 watt AMPS phone with a simple 103 AFSK modem and a GPS. The car could be called and a command sent to retrieve the GPS or unlock the doors. I haven't seen the hardware for the current OnStar devices, but I'm certain it includes a new CDMA cellular phone, an in-band modem whose supplier shall remain nameless and a GPS. In addition, the new OnStar gear has access to the vehicle networks to permit door unlock and query of the diagnostic modules (similar to what a service shop can do). Remote engine diagnostics capability is interesting to fleet owners. Ditto for the theft recovery. Most people buy OnStar for roadside assistance.

Wasn't the governmnt pushing for an OBD-III standard that would pretty much incorperate the CDMA and a full emissions/performance monitoring system?

On Star is just an "acclimation" product to get you used to the idea. Next, they'll trot out a study showing how much money everyone would save if such systems were mandatory and government controlled. Especially in light of the new Medicare bill just signed.

Bank on it...

First generation OnStar units used a 5 watt AMPS phone with a simple 103 AFSK modem and a GPS. The car could be called and a command sent to retrieve the GPS or unlock the doors. I haven't seen the hardware for the current OnStar devices, but I'm certain it includes a new CDMA cellular phone, an in-band modem whose supplier shall remain nameless and a GPS. In addition, the new OnStar gear has access to the vehicle networks to permit door unlock and query of the diagnostic modules (similar to what a service shop can do). Remote engine diagnostics capability is interesting to fleet owners. Ditto for the theft recovery. Most people buy OnStar for roadside assistance.

Well if the first generation used an AMPS cellphone then you could listen to it with you modified scanner. It was hardly secure and wouldn't require the goverment to erect their own "cell" to listen to your communications. I am sure the latest revision intergrates with the vehicles OBDII compliant computer. Combine that with a GPS and they know everything about you and you car. When and where you were going how fast you were driving. How often you stopped to get gas. If you overrevved your engine etc. I work in the vehicle Diagnostics industry but before that I was a "hacker"