Many people thought 867-5309 was the real number of a girl named Jenny. The song caused a blitz of people dialing 867-5309 (which was a valid number in the US) and asking if Jenny was there. Now many years later most of the 867-5309 numbers have been taken out of service because of constant nuisance calls.
However, there are a few left and right now one of the last remaining is on eBay. A New Jersey DJ is selling his 867-5309 number and claims he receives between 8000 - 10,000 calls per year making this the perfect number for a business. To check out the auction here is a link, 867-5309 Phone Number.