Allows you dial “android secret codes” more easily, it also works on devices that don't have phone app (like almost all Honeycomb devices). Secret code is a charcter sequence typed on the phone application, most known secret code is *#*#4636#*#*. Secret codes unlocks hidden application usually used by service engineers. PLEASE BE CAREFUL!!! SOME SECRET CODES COULD BE VERY DESTRUCTIVE!!! Please don't ask me about codes, ask google. Also remember that different devices have different codes.