From http://www.w3schools.com (Copyright Refsnes Data)

.NET Mobile Emulators

Mobile applications can be tested and viewed with different emulators.

Using your Browser

Since mobile web pages detect your browser, you can test your mobile applications with a standard browser.

When a mobile web page detects a web browser it will produce HTML output.

The Openwave mobile browser is the most common browser used in Internet-enabled cellphones.

An emulator can be downloaded from http://www.openwave.com

This toolkit contains emulators for most of the different Nokia devices.

This toolkit can be downloaded from http://forum.nokia.com

Here you'll find answers to basic questions regarding the Windows Mobile development platform, along with different downloads: