Thanks for the clarification, ice, and welcome to BigBlueBall. You are indeed correct. Mibbit does work on an iPhone, although the UI is not optimized for the small screen.
The homepage is misleading, because they have big Flash demo right in the middle of the page and on the iPhone, it says "Flash 9 Required..." I mistakenly assumed this meant Flash was required to use Mibbit to connect to IRC.
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