I remember first remembering phone numbers by the way the sounds of the numerals felt together. I'd subvocalize them as iambs to memorize, with exaggerated stress. I think that was part of the fun of numbers with sevens and zeroes.

Telugu number sequences required a completely different prosody that I never devised, sadly, because I never needed to memorize them. (Much much later, hearing someone say their phone number in Italian reminded me of what this internal prosody could have been.)

I remember I had to relearn our car's license plate number shortly after I learned it, when the state prefix changed from CA to KA and all the plate numbers were reassigned. I could read enough by then to know that the state's name started with a K, and it was logical, but the change was still mildly disconcerting. And then a few years later, I'd look back at the CA license plate days as a time from a different era, as so many other things changed at the same time in my life and outside.

(And now I see the switch was in 1990, and so it was.)