I have blocked specific numbers on my Blackberry. Will the callers know?
did you set a policy in firewall ? how did you block them ?
if you know how to unblock callers, it's easy to test :
block a friend or tell a friend to block you,
then try to call and find out what does it say,
a message saying, you are blocked or just a busy tone.
Typically not, though it depends on how you've blocked them. Usually, when you block a number, if the person calls it will just play a "busy tone", indicating you are on the line with somebody else.