A really nifty feature built into BlackBerry® smartphones is the ability to block specific types of incoming messages using a firewall. This feature will allow you block text messages and PIN messages – as well as personal or enterprise email messages – from arriving on your BlackBerry smartphone.
Here’s an overview of how to set up the firewall, as well as how to allow specific contacts to your allowed senders list so they can still contact you. You also have the ability to allow anyone in your BlackBerry smartphone address book to still contact you if desired. Keep in mind, using this feature may cause you to miss messages from friends whom you haven’t blocked, but haven’t explicitly allowed either.