*-v*, *--voice*::
The verification should be done over voice, not SMS.
+*--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
+Check the developer tools for a redirect starting with signalcaptcha://
+Everything after signalcaptcha:// is the captcha token.
+
=== verify
Verify the number using the code received via SMS or voice.