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it would be nice if it could "answer" the phone on your behalf and then read a message saying you're not allowed/interested in talking with people from phoning from unknown numbers. "Good bye" ?? Otherwise im afraid people would think they have the wrong number or something? If you're phone is continuously unavailable..
http://appworld.blackberry.com/webstore/content/3535 try this it might just work. I know it works with calls you do not want to receive if you can see the number.
I'm using Call Blocker Pro, it's working fine for this purpose.