Testing this simple ASP.NET MVC application, you can enter
the user credentials (Figure 1).
Figure 1: Log On form
If your information is correct, you’ll see a textbox
appeared asking you for a verification code to enter. At the same time, code is
generated and set to the mobile number of the user (Figure 2).
Figure 2: Text message received
You receive the number and can enter that to verify the user
Figure 3: Enter verification code
And you’ll be signed into the site! Next time, if you visit
the page with the same IP address and browser, you will automatically log in
without dealing with the verification code.