1. From the home screen, tap Phone.
   
2. Touch and hold the desired number in the Call Log.
   
3. Tap Add to block list.
   
4. Tap OK.
   
5. To unblock a number, tap Call Guard.
   
6. Touch and hold the desired number.
   
7. Tap Remove from block list.
   
8. Tap OK.
   
9. 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.