There s a program caled 'blackballer'
Get it on Nokia site.
It works for all Simbian softwares
I ve N serie mobiles,and i ve this program.

People get 2 beeps,and get disconected.
They think line is bad ,where on my side call do not even come true.
I can add any numbers to blacklist,then customize add them for 1 day or 2 days or permanently etc.......
Cal don't even come true and so do messages