I'll worry about that come 2019
Regular OnStar is only free for 6 months, but I have no plans on renewing that unless a subscription is required for the over-the-air updates I mentioned earlier.
I'd give you guys my car's phone #, but minutes for it are expensive as hell and I don't trust any of you not to drunk dial it! This is a rather pointless feature unless you have a non-Bluetooth phone (or don't have a cell phone).