Hi and welocome to the forums! There is no option on the BB that will allow that. Your carrier will have a call. You can have your carrier block these numbers. There is a free application called ICALLmanager that I use. It allows you to blacklist numbers, send unknown numbers directly to VM, allows only calls from your address book, and a do not disturb option where all calls are sent to VM. Here is the link for Icall http://www.i-softwarelabs.com/icml.html Hope this helps! Please let me know if you have more questions. If not please take a minute to resolve this thread by using the options by the Kudo's star. Thanks!
Click Accept as Solution for posts that have solved your issue(s)! Be sure to click Like! for those who have helped you.
Install BlackBerry Protect it's a free application designed to help find your lost BlackBerry smartphone, and keep the information on it secure.