This extra update for GDR2 enabled Nokia Lumia phones allows users to block certain phone numbers from making calls and also blocks certain contacts from sending you SMS messages. The update gives you an updated Extras & Info section with a new heading called "Call + SMS Filter". As you can see from the screenshots in the slideshow below, there is nothing terribly headache inducing here, although some Nokia Lumia users contend that the feature is carrier-blocked by some mobile operators. Finding out that your carrier has blocked the new features that allow you to do some blocking, is enough to make you reach for the aspirin.
One of the cool features in the update is the one that allows you to link a Live Tile to the Start screen so you can monitor how many calls and SMS messages have been blocked. You can also check out the new features by watching the video below. If your Lumia model doesn't have the GSDR2 update yet, this will be the closest that you get to the Extras & Info update for now.
source: WMExperts, WPCentral via DailyMobile