When you next login to the Applications Portal you will be asked to supply a phone number to which SMS messages can be sent.
After adding your phone number, a code will be sent via SMS, please enter the code and click confirm code. This will register your phone number and take you to the homepage.
Sometimes you will be required to re authenticate. When you try to login, an SMS will be sent to your registered phone. Please enter this code in the popup. You will then be taken to your homepage.