Looks like people have found the page for an experiment we've been running for phone-based authentication.

Folks - it's just that - an experiment - and will likely go away at some point. We always work on improving authentication, and try out different things every now and then. We're working on something that I believe is even better, and when that's ready for a public trial we'll let you know.

I'll label that experimental page appropriately when I get a chance so people don't start depending on an unsupported feature...
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