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Identifiers other than phone numbers #1181
It'd be nice to be able to identify people by something other than a phone number. Not all my contexts have a phone number, or at least not one I know, but do have an email address, for example. Phone numbers are generally considered more sensitive than email addresses, and have the nice property that it is easy to have many of them, among others.
This might also be an opportunity to think about fallbacks other than SMS, such as email.