Il 30/12/2021 03:29 Phillip Hallam-Baker <phill@xxxxxxxxxxxxxxx> ha scritto:
If we were to redo telephone numbers, we would not do exchanges or area codes. They are no longer necessary and to the extent they still have meaning, it is privacy violating meaning.
There would be reasons to keep country codes, though. Both organizational (they naturally federate the namespace and define jurisdictional spaces) and functional (at least you know the part of the world where the person is from, and the languages that are likely to work when communicating).
For the same reasons, some big / federal / multinational countries might want to keep area codes as well. Indeed, even in a mid-sized monolingual country like Italy it is very useful to know at a glance whether a fixed number is from Sicily or from Venice. You could make this optional and subject to user consent, but in many cases it would make sense to get a geolocated number.
We would probably use Base32 instead of just numbers. That gets us to some fairly impressive compact identifiers. 5 bits per character, an 8 character sequence is sufficient for a trillion identifiers.
Sure, from a technical point of view, @KXJL-M4AA is acceptable as an identifier. It is more usable than@MB5S-R4AJ-3FBT-7NHO-T26Z-2E6Y which gives us 112 bits of work factor.
I didn't look up the science that possibly exists on this, but I suspect that strings made only of numbers or only of letters, even if slightly longer, are easier to remember than mixed strings, especially if there is not a rigid pattern on where the letters and the numbers are. Number-only strings also have the advantage that they are universal, while half of the planet is not native in the Latin script.
It's also true that memorability just for the sake of it - not associated to any vanity value in the string - might be a secondary requirement, now that we have contact books etc. However, it's still useful when you need to add a contact in a non-digital way, i.e. with someone spelling their identifier or writing it down for you.
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