SMS Authentication To login by using SMS OTP authentication, you need to do the following steps: 1. On the login page, click on the SMS OTP icon. The web page will appear a new text field to enter the Passcode like as: Figure 1: Authentication Method Page 2. At the same time, user will receive SMS that was sent to their mobile number. 3. Then, enter the OTP code from the SMS on the web page. 4. Click on the Login button to login.