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I updated Signal on 2020-05-16 and the new version now says "Device no longer registered, This is likely because you registered your phone number with Signal on a different device."
I don't know why this has happened since I still have my US number. However I can't receive SMS to it since I now live in the UK. So I'm forced to change numbers again, sigh.
My old number:
+1 650 334 8706