DIY 2-line phone services Everyone knows that only geeks work at Radio Shack. I should know, I worked as a geek-for-hire for several years. We Radio Shack geeks never ask questions like “will the cable company charge me more for splitting the signal off into my bedroom?” or “will the phone company make me pay extra for receiving faxes?” We know better. (In case you don’t know, you pay the cable company...