Got it today on the cell phone.  The LG cell phone has a setting so it won't answer unless it is in my contact list but records the number.  The home phone, Ooma Premier, "no more robos", and has a block list I can add to but I rarely bother with anymore since it has caller ID.  One simple rule, if the identifying caller only has a city, or just a number forget it.  Thanks all for the information!