From personal experience of being a South African, I have never ever heard of anything like this, unless you're in Joburg and paranoid about every second of your life.
Yeah way to escalate a smash and grab into a homicide! Getting a new phone is always cheaper than dealing with the dead guy pooling blood next to your car.
Iām a South African and out of all my friends and family only one carries a gun and never in his lap.
From experience (several yrs ago), you keep a gun in your lap when you drive the car. All the time.