In S2E13, "Road To Rhode Island," Stewie tries to call Lois, but not knowing the number, dials 867-5309. In Rhode Island, this is the number of Gem Plumbing and Heating Company. And yes, their radio jingles have used the well-known tune.
One of our readers informs us that "867 was (and still may be) the exchange for the Brown University residence halls at least circa 2001. [867-5309] "was the phone number of a freshman double room and the girls who had it were frequently the victim of prank phone calls. I have a feeling Brown gave that particular number up to Gem Plumbing."
(We thought it was enough to merely allude to the song from which this phone number originates, but judging by the number of emails we've received informing us of our "omission," we should have made it more obvious. So for the record, "867-5309/Jenny" was a popular song by the band Tommy Tutone. It peaked at number four on the Billboard Charts in early 1982.)