GM OnStar feature - pictures

Simple buttons built into rear view mirror allow owners of GM cars to contact OnStar command centre with different queries.

When hooked up to live calls, Steve is amazed at the sheer variety of questions GM owners ask.

Our man Fowler listens in as OnStar operative Quiana takes a call, then watches on screen.

Once behind the wheel, nav routes are transmitted via 4G, enabling us to follow the directions in-car.

Map shows where in US in-car buttons are being pressed.

If they’re involved in an accident, the tech alerts specially trained advisors automatically – and they in turn get in touch with the emergency services.