Testing on desktop for mobile access

I have a web application that works well on desktop. For it to work on mobile devices, I created a sub-folder called 'mobile'. I then modified my global.asax file to redirect to this folder when the application is accessed on a mobile-device. I now want to test the application for mobile access using my desktop. When I run the application, the browser launches and since it is on desktop, it shows me the regular page and not the pages in the mobile folder. I want to simulate access using my Visual Studio. I saw some downloads for each type of devices (iPhone, Windows phone, Android, etc.). Is there a VS plug-in available to test for mobile?