Hop-On, a small cell phone company based in Irvine, Calif., has released what it says is the antithesis of Apple’s iPhone — the HOP1800, a $10 bare-bones GSM cell that doesn’t take pictures, doesn’t play music, movies or podcasts, doesn’t surf the Web, and doesn’t even do text messaging. In fact, it doesn’t even have a screen of any kind. So what does it have? A standard keypad, plus a green button for placing or answering calls and a red button for ending them.