A:AnswerUser manual does not specify the range because it varies with location, weather, obstructions etc. If you still want to know I will test it for you.
A:AnswerQuiet mode quiets all phone operations not initiated by the user. You can also just turn the ringer volume of each handset or the base phone lower or off thru the menu commands. I keep a handset in my bedroom at night in case I need it, but the ringer volume is off so a call does not wake me. The other handset and the base still ring.