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My understanding is they use "war dialers" mostly to find them. Dial numbers at random (in sequence) whatever - and listens for the tone.
I have a number that is listed as a personal number, it blocks all OUT OF AREA and Private Calls.
Within 3 days or so of getting this number I started getting junk faxes. I called the number and they had an automated removal system. The phone number is listed as a personal number with caller ID.
It is illegal under federal law, although - last time I checked - there was no case law on this (It has been a couple years).
I think you only get like $250 - $500 for someone doing this. A fax operator could challenge the law on 1st ammendment grounds.
I doubt anything would happen to them, but hey - you might get a couple hundred out of it....
After calling the automated removal line - I haven't gotten one since.
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