*77 is to turn on anonymous call rejection. You only have to turn this on once. You do it when no one is on the phone. You pick up the phone, hear the dial tone, then dial *77. Hang-up afterwards.
For full information on this feature use this link if you have regular telephone service with Verizon
If you have FIOS Digital Voice, which you know you have if you have dial area code for local calls, then use this link for full information and instructions how to turn on
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