I thought that even if your Onstar isn't activated, when you press the blue onstar button you'll still get a live advisor (or a recorded message stating something to the effect that you need to press the button again to talk to a customer rep). Then the advisor will try to sell you the service and walk you through the signup process.
So if nothing at all happens when you press any of the onstar butons, it may actually be a hardware problem.
Or maybe I'm completely off base?
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