BlackBerry Messenger is a messaging utility built in to BlackBerry cellphones. You can set yourself as available or away to let people know if you're occupied and see your friends' statuses. BlackBerry phones also allow you to receive notifications when your friends sign on and off or you receive a message. If for any reason you want to delete a contact from BlackBerry Messenger, you can do so from directly within the utility.
Open BlackBerry Messenger and go to the "Contact List" screen.
Click the contact you want to delete.
Click "Delete Contact." Press "Delete" to confirm.