According to google it is a number from an early 80's pop song that at the time "caused a fad of people dialing 867-5309 and asking for "Jenny"" https://en.wik

According to google it is a number from an early 80's pop song that at the time "caused a fad of people dialing 867-5309 and asking for "Jenny"" https://en.wikipedia.org/wiki/867-5309/Jenny https://en.wikipedia.org/wiki/867-5309/Jenny