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1. Press *24 and enter the four-digit MASTER CODE _ _ _ _ (beep). 2. Enter the area code reference number (0 through 9) _ then press * (beep). 3. Enter # # # # then press * (beep). 4. Repeat steps 2 and 3 to delete additional area codes. 5. Press 0# TOGETHER to end this programming step (beeeeeep). 3.5.9 Display Phone Numbers (1815, 1817 Systems Only) Use this programming sequence to display phone numbers programmed under known directory codes, i.e. if you wanted to see what phone number was pro