Mom's 2011 Enclave has (had) OnStar. It came in handy when they stopped en route back from a trip to Lake Charles to visit relatives in a Houston suburb. No one was home. Dad disturbed a wasp nest on their porch, was stung a few times. He didn't have a history of adverse reaction but perhaps age became a factor. He became woozy and fainted while driving on the highway. Mom managed to grab the wheel, steer to the shoulder and stop the car. She hit the OnStar button for help, EMS arrived promptly. OnStar no longer functions on her car because (they said) the hardware doesn't support the updated airwaves signal. The offered alternative is a phone app. She has a cell but is tech-phobic on them, didn't want to deal with that so canceled the service. She won't, anyway, any longer drive alone further than the 11 miles highway distance for a hairdo in the next town.