I googled "Jenny's Number" thinking it was a SaaS platform
Here’s a few examples of what happened to people who had that number:
In 1982, WLS radio obtained the number from a Chicago woman, receiving 22,000 calls in four days.
In 1982, Southwest Junior High School received up to two hundred calls daily asking for Jenny in area code 704.
More examples on Wikipedia - https://en.m.wikipedia.org/wiki/867-5309/Jenny