I don't directly remember any new numbers, but I know how the DTMF sequence for the number is supposed to sound when dialed. I could always work back from that to get a human-readable phone number if I needed it.

Like Jebdm, the only numbers I really know are those that haven't changed in a few decades and my own cell number. But I also prefer face to face conversation over telephone, so I'm only likely to call you if I can't find you. (And then I'm more likely to just text or e-mail....)