How to Block Private Calls or Numbers in Android 4.4.2 Kitkat

Samsung Galaxy S5: As we all know that the default call rejection feature in Samsung Galaxy S5 can be used to block unwanted or unknown calls as long as the callers have numbers, that's why this feature can't be used to block those who don't have numbers. So, if you wish to not receive any private call or calls from those who hide their phone numbers, you can use a third-party app in the Play Store that has the ability to block private calls. Blocking private calls will set your phone to not notify you when you have incoming calls from those who hide their phone numbers so that you won't be bothered again with them.
How to block private calls or numbers using Blacklist app?
There are some apps in the Play Store that can be used to block private calls. But, as the example, we'll use Blacklist app in the following steps to block private calls:

1. Download install Blacklist app from the Play Store.


2. Once the installation process is completed, open the app.


3. At the first time use, you will be provided with the term of use and privacy policy screen. Tap OK button to continue.


4. In the main screen of this app, in the Control tab, tap and then tap Blocking numbers.


5. In the Blacklist tab, tap Private numbers.


6. Tap End call and then tap Save button.


7. From now on, any private call will be blocked. FYI, you can still see all blocked private call logs in the call logs in the Phone app or in the blocked logs in the Blacklist app.