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.
Tap the Menu icon.
Tap Settings.
Tap Call.
Tap Call rejection.
Tap Auto reject mode.
To block all calls, tap All incoming calls.
To block specific numbers or contacts, tap Auto reject list.
Tap the + icon.
Enter the Desired number, and tap SAVE.
To remove a number from your block list, tap the Checkbox next to the desired number.