It appeared that Lottor and Shimomura had reverse-engineered and built a special version of the firmware that allowed the phone user to easily change the ESN from the keypad. There could be only one purpose for doing this: to clone to another cell phone number. I had to smile and shake my head. Here was an even bigger puzzle: Why would the federally indicted hacker and the security expert want to clone cell phones? It was something I never did figure out.