Note: Permission must be set to ALLOW in the Options->Advanced->Applications app for BuzzOff.
BuzzOff will block any phone number, block callers with private or unknown callerid, do not allow caller to leave a voice mail.
BuzzOff is the only callerID blocking application for the BlackBerry that has Pickup and Hangup feature. This will not allow the caller to leave you a voice mail. The caller will just hear a busy signal or the message from your carrier.
You can also select the phone number to block from the CallLog, Messages and AddressBook application. Just select Block Caller from the menu and select the type of block you want.
Get it HERE
OTA Free Trial HERE