Adobe offers a great application called Device Central as part of their Creative Suite bundles. The application makes it easy to test graphics, Flash, and video content and simulated mobile phones and other devices. Adobe just published another update that adds support for more phones and devices.
You'll need to log on with your Adobe ID (they're free). This is important to check out for mobile content creators.
If you are not familiar with Device Central, be sure to check out this overview.