From the home screen, tap Phone. 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.
Press the Menu key.
Tap Call settings.
Tap Call rejection.
Tap Auto reject list.
To add a number to the blocked callers list, tap the Add icon.
Enter the desired phone number, then tap Save.
To remove a number from the list, tap the Trash icon.