Caller ID requires a display telephone or an add-on display unit. The telephone number, or name and number, of the person calling you will automatically appear on your display screen. If you choose to answer the call, the number will remain on the screen until you or the caller hangs up. You can then decide how or whether to answer the phone. To add numbers to the list- To remove numbers from the list.
Some telephones sets are capable of providing a standard ring.
The distinctive ringing for both Teen Service and Priority Call is not distinguishable. Also, calls from a pay phone cannot be blocked. Calls from numbers on your list hear a recorded message saying you are not accepting calls. Your phone doesn't even ring. Pick up the phone and listen for the dial tone.