Who does remote car starters on BMW's?

Dude… I like the idea and all, but wouldnt the the actual “remote start button” itself take the place of your cell phone? I mean instead of pressing a button on your cell phone “in school” couldnt you just press the “start” button on your remote start “in school”? Alot of them half a half mile to 3 mile range in which you can start your vehicle.