Originally Posted by Synyster
He means that someone could hack your phone and access the onstar app, thus using it's features to start and unlock your car.
They can't hack your phone and access the app if you never install it.
He said it was a bonus in his book that the 2010 Camaro wouldn't support the app, so they couldn't hack your phone and steal your Camaro. Since you can achieve the same effect by not installing the app, I fail to see how not having a choice is a bonus.