The verification should be done over voice, not SMS.
Voice verification only works if an SMS verification has been attempted before.
-*--captcha*::
+*--captcha* CAPTCHA::
The captcha token, required if registration failed with a captcha required error.
To get the token, go to https://signalcaptchas.org/registration/generate.html
For the staging environment, use: https://signalcaptchas.org/staging/registration/generate.html
After solving the captcha, right-click on the "Open Signal" link and copy the link.
+*--reregister*::
+Register even if account is already registered.
+
=== verify
Verify the number using the code received via SMS or voice.