Serious question. Before social media and everybody’s info becoming readily available online, how did phonebooks get their info? How do they do it now?
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When you signed up for telephone service, you had the option to have a listed number or unlisted number. A listed number means you gave the phone company permission to publish your name, phone number, and address. Most people opted for a listed phone number so that others could get in contact with them. Then a company like Yellow Pages would compile those numbers in a given region into telephone books that would be delivered to the house of everyone who had a listed number.
You also had less to worry about having that info out in the open because the analog systems of the time made identity theft much more difficult…
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