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Well... yes, email and sms and telephone. They're protocols that anyone can decide to support and participate in. Honestly SMS was a good solution for my needs for 1:1 messages, it just didn't properly evolve to support the f a featureset we expect from modern messaging.

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I was actually thinking about this before I posted and discounted email. It has high interoperability but you cannot move your email address to a different provider if you didn't opt to use a domain you owned.

This is obvious when you say it but I can port my phone number between phone companies whereas I cannot move my Gmail address to a different email provider.

You can see some proposals for server migration/fallback here:

https://github.com/matrix-org/matrix-doc/issues/915

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