To access the phone app, tap the Phone icon from the home screen. 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. Turning Call blocking on does not block text messages.
To block calls, from the phone app, tap MORE.
Tap Call blocking.
Tap Block list
To turn block or unblock unknown numbers from calling, tap the Block anonymous calls toggle on or off.
To add a number to your block list, enter the Desired phone number in the "Add phone number" field, then tap the + icon next to the field.
To remove a number from your block list, tap the Minusicon next to a name or number on your block list.