Nice! From now on - if he ever gives out his secret pin number to me - I'll have to remember a 4 digit long access code to each one of my friends.
Maybe if I am lucky the system will let me just add the extra numbers to the phone number I am dialing so I can add them to the memory of my own phone. If I have such a phone.
So I guess the phone numbers have also started to inflate
So far I encountered this only on a single mobile phone number but as I can see you can buy Call filters for 90-160 USD for your land line as well.
What a progress in human communication !