Except that not everybody knows that. I use the # for information at stores, when asked for a #, and the cashiers usually have no idea what 555-1212 means. In my sample, the vast majority of people do NOT know.
Except when buying a TV -- that would be W1A 1AA
I told the cashier "That's me, don't you recognise me without the makeup?"
I said how in the comment to which you replied.
Where did I say, "fact that they showed no reaction"? Why do you interpret something unstated as a fact?