Have you ever wondered what happens behind the scenes to get a smartphone pushed to market? If you have, congratulations on advancing to the next echelon of mobile geekhood. We've often pondered the same thing ourselves, but the industry has been historically tight-lipped about the ins and outs of designing, testing and launching a smartphone. Fortunately, our thirst for knowledge was quenched by none other than AT&T, which happily loaned us the time of two senior product managers, the folks that make the magic happen.