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Not really a work around, but you could get a VOIP number from MySudo or Hushed or a similar service and use that to sign up for Signal. Might at least be more private if you go about it with like a prepaid card and temp email or something.
I thought signal switched to allow usernames a few months ago
You can hide your phone number from other users, bit still need a phone number to sign up or to use your account.
