CarNet (in my 2019 model GTI at least) will automatically call 999 if my car is in a crash and the airbags deploy and I don't specifically cancel the request within 30 seconds (because I'm either dead or otherwise unable). Via the app you can also set alerts for various events such as if your car exceeds a set speed limit or drives outside a defined permitter - which is useful if you have teenage kids who borrow the car I guess? Personally, I don't. And even if I did, they sure as hell wouldn't be borrowing my GTI! I think it does a few other bits, and mine is paid for for the first three years but it's not something I will be paying to renew. If they throw it in for free, then great. But otherwise, it would be no real loss.