Hi,

The beauty of ASP.NET is, it will render the content based on the request device. So, general ASP.NET Website works absoluetly fine with all Models which u have mentioned.

Some Mobile manufacturers provide, simulators which u can use of free of cost.

Check the following links for more information on developing web apps for Mobile devices,

http://roopeshreddy.wordpress.com/2010/07/25/mobile-development-in-asp-net/

http://roopeshreddy.wordpress.com/2011/04/07/testing-asp-net-web-apps-in-google-android-emulator/

http://roopeshreddy.wordpress.com/2011/03/05/guidelines-for-developing-web-apps-for-apple-iphone/

http://roopeshreddy.wordpress.com/2011/02/05/developing-asp-net-web-applications-for-windows-phone-7/

http://roopeshreddy.wordpress.com/2010/11/18/testing-asp-net-web-application-in-iphone-simulator-available-in-safari-browser/

Hope it helps u...