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Phone numbers only work that way due to laws requiring number portability. Otherwise the provider is encoded in the number range.

It's funny you mention that because for a while the supposed deal breaker with Mastodon was the inability to migrate accounts (even though no other service let you do that).

But now you can, so we're on to the next whack-a-mole.

But if you own your own domain and use it for your own mail, you do take your identity with you? Isn't this what AT protocol is promising with Bluesky's identity system?