Well, time to time, I use my iPhone 3GS to browse on the forums and also make some posts. Although it loads fine, it's quite difficult to make a post since the style isn't iPhone optimized and I need to scroll and zoom in to read whats on the page.
I think that vBulletin has some kind of plugin that detects a smart phone browser like Mobile Safari or Chrome on Android so it will view a more optimized page on the phone. As smartphones are getting more popular, it wouldn't hurt much to have a optimized site for these devices.
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