From the Home screen, select the Phone app. Note: The call blocking feature may not affect phone calls made or received via third-party apps installed on your device. Please contact third-party app developers for assistance with such applications.
Select the Menu icon.
Select Call blocking.
Select ADD A NUMBER.
Enter the Desired number to block, then select BLOCK.
To block a number on the recent call list, from the Phone app, select the Recent call icon.
Select and hold the Desired number to block.
Select Block number.
To unblock a number, from the Call blocking menu, select the X icon next to the Desired number.