I have one, but via a weird series of events.

My cell provider offers free <service name> for a year, but I can't take advantage of it, because shit's broken on their end, for me in particular. Instead, I have it through a promotion I got a decade ago that gave me an OBD2 WiFi device and a free line for it (with 2GB free per month!) for life, but also roadside assistance as a consequence of other stuff, for some reason.

I had a need for it once and happened to remember it, and sure enough, in comes the truck, sans bill.