Caller ID is standard now, but it wasn’t always. When widespread adoption started in the 1990s, it was controversial to the point that it was widely viewed as an invasion of privacy. For people with unlisted phone numbers, the new feature was declared a bridge too far. As a result, Sen. Herbert H. Kohl (D-WI) introduced a bill to allow callers to block their numbers from appearing on caller ID. ‘The Senator’s interest is in balancing the privacy interest
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