This came up in a discussion the other day, and by coincidence it now showed up in the "on this day" reminder on another network where I had also posted it.
β² @clacke@libranet.de: Me, calling dad on his mobile: Something is weird with your landline. It says "number not in use".
Dad: Nope, nothing wrong. I canceled it. They were raising the monthly fee a couple of euros and we have mobiles, so we don't need it.
Perfectly reasonable from an objective point of view, but .... but ... That phone number is a decade older than I am! I literally have life memories tied to that number.
I didn't know I could feel this way about five simple digits.