I can view your site just fine from both my computer and my phone. I'm not using an iPhone though, I'm on an HTC Touch (and anxiously awaiting an android phone to come to canada!) on Telus Mobility.
I would have to guess the issue lies with your phone provider, not the iPhone. I can't think of any reason why an iPhone wouldn't get to a specific site, it's just a mobile computer. The issue is more likely to be with the network routing. Maybe your iPhone has the wrong default gateway set.
Have you tried browsing to the site via your server's IP address?
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craig0r
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