Cn anyone tell me the secret codes to switch on/off the "answer on busy" for Vodafone Home Phone Voice Mail?   I accidentally pressed something while checking voice mail and the lady said that voice mail would now not respond to unanswered calls.  I checked instructions but even the one that says press3 then 3 then 1 to change the number of rings doesn't work.  (3/3/1 is to record the greeting again)