General Call Blocker

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http://androidforums.com – Dear Fellow Users, Am looking for a Call Blocker which can actually hear the blocked caller a busy tone instead of hanging up the calls. I think hanging up is more rude and silent doesn't prove anything. Kindly update me if any such call blocker is available for HTC Wildfire S which can show the user as busy. I used advanced call manager but it failed to work, though it works perfect in Nokia 6600. Regards, Partha (General)