I had an idea, about 90% of the time I need internet on my smartphone, my car is between me and the cell tower, or if not it is within half a mile of me.

Cell phone companies could put "always on" cell phone repeater in my car, drinking from a large li-ion battery that is charged by the engine, so when my smartphone doesn't have enough punch to reach the cell tower, it has enough power to reach my car's repeater, which has enough power to reach the cell tower. If I could charge the company 0.001 cents every time someone else's phone routes through my repeater, the company could save billions on cell towers. Use the nation's cars as a mobile cell phone network. A Billion dollar idea right there.