code: public void requestSmsVerificationCode(boolean androidSmsRetrieverSupported, Optional<String> captchaToken) throws IOException {
      this.pushServiceSocket.requestSmsVerificationCode(androidSmsRetrieverSupported, captchaToken);
    }
docs: Request an SMS verification code.  On success, the server will send
  an SMS verification code to this Signal user.
  
  @throws IOException