Григорий Клюшников:SMS costs money per message and this alone means it's a non-starter. Besides, phone numbers have other issues:- The security, and the continued existence, of your phone number is wholly dependent on your carrier. You can't take it into your own hands.- Phone numbers are tied to countries. This is a problem for people who travel.- You can't self-host a phone number.- In many countries around the world, a government-issued ID is required to buy a sim card, which means no anonymity whatsoever.12 Aug 2022 at 13:05