One of the best rock tunes ever written, "8675309 Jenny Jenny" was a blazing meteoric hit by a band that produced few others:

Rendition of the song (bet you can't play it just once):

https://www.youtube.com/watch?v=boaJCrHNRMA

Story of the song (along with a history of problems/facts about the phone number itself before and after the song hit):

https://en.wikipedia.org/wiki/867-5309/Jenny

The band:

https://en.wikipedia.org/wiki/Tommy_Tutone

In my formative years I rode the CTA a lot, and they always had an announcement, "call 836-7000 for transit information". The number was burned in my head and it's worked in every store I've tried. (You can add any Chicago-area area code; 847, 312, etc.)

Yes, it worked at a Safeway in San Jose too. I love that someone also had this stuck in their head and used it to sign up for grocery discounts.