Having a bank account without having a phone number

https://www.devever.net/~hl/phonebank

and overpriced telecommunications networks ever to have blighted the earth, at least in this century), the carrier eventually decided I clearly don't need the number after all and

https://www.rfc-editor.org/rfc/rfc3966.html

https://www.rfc-editor.org/rfc/rfc3966.html

[ E.123 ] International Telecommunications Union, "Notation for national and international telephone numbers, e-mail addresses and web addresses", Recommendation E.123, February 2

That's everything I could find.
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