Great for home or business! Secure your phone line by restricting who can place long distance call. A 4-digit code is assigned to each authorized person or department to enable them to place calls.       Free Installation   No Monthly Charge   Detailed Call List, separated by name or code on your monthly bill   (see example below) Easy Dialing Procedure     Dial 1+ area code + number. A voice will prompt you to enter your personal identification number. After the code is entered, the call will be connected. If the wrong code is entered, the call will not complete.