I have checked on the settings bar in the calls area but it does not seem to have this feature installed on it. Is it better to download an App. for this, if so which one is recommended?
You can try Calls Blacklist - Call Blocker by Vlad Lee. It has the highest rating of all the blacklist apps available in the Play Store. It not only blocks calls but text messages as well.
How do I block unwanted calls on my samsung galaxy centura android 4?