Anticaller

This free app is able to block any call from any number that you blacklist. You can even specify if you want to block calls from any unknown or private number.

It has the following features:
-Blacklist any contact-
-Easy activation/deactivation to block cany kind of call.
-Notification for any missed call.

Next release will have a log for all the blocked calls and more preferences about the notification setup. Importing a list of contacts to blacklist should be possible as well.