But tell me this? Do you have both a cell phone and a house phone next to you? Or, two cell phones? When you are in your car, do you have two cell phones? Or a secondary form of communication?
How many flashlights do you carry with you? How many knives? Guns?
When I drove Truck (OTR) I had a set of keys that stayed in the truck, a set in my pocket, and a spare in my wallet, and a spare in my right boot. A knife in my pocket, and one in my left boot. A tire thumper by the door, and one in each side box, and one strapped to the frame rail under the hood on the driver's side. Extra $$ in a spot in my wallet, left boot, and hat, and left side box. See my point? I am an "extra" kind of guy...
Now at home, off the road blah blah...
Always carry the cell when I leave the house. Flashlight on keyring, flashlight(s) in car. Back-up battery (charge phone, Kindle, Radius, etc), Back-up battery (jump cars, etc), gloves ,hat, blanket, spare coat, all that stuff - and a police thumper between the seat and the door.
But only the Radius goes with me, even on a day trip...