Here, on regular phone lines, you can punch in a code (shown in the phone book) to block your number from being shown. You can also punch in a code to block calls from any phone with a blocked number.
I haven't checked to see if you can do that with FIOS or Comcast, but with caller ID, I just don't answer calls that don't identify the caller.
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The descent of man ~ Nixon, Friedman, Reagan, Trump.
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