In this article, readers learned how to use Nexmo's Number Insight Advanced API within an ASP.NET web application. The API provides various insights about a phone number, including its international and local format, country of registration, line type detection, mobile country code, and roaming information. The article demonstrated how to create a controller method to handle the API request, store the results in sessions, and redirect to a view displaying the advanced insights. The view displays the retrieved data, allowing users to see detailed information about the phone number they inputted.