if you install the HideUserAgent app from the app manager, you can set your browser to use the iphone's user agent:

5.0 (iPhone; U; CPU iPhone OS 3_0 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7A341 Safari/528.16

however, it doesn't render very well at all in MicroB.