Anonymous Call Rejection
You can use Anonymous Call Rejection to reject most phone calls from callers who have blocked the display of their telephone numbers for Caller ID. Anonymous Call Rejection does not block calls made to you from outside your local calling area or through operator assistance.
When Anonymous Call Rejection is on, your phone will not ring if callers have blocked the display of their number. Instead, callers will hear an announcement saying that you are not accepting blocked calls. They will be instructed to hang up, unblock their number, and dial again if they want to reach you.
All calling features are subject to availability and compatibility restrictions.