Has anyone had success using custom otf fonts on the iPhone?

Question

It looks like there a few working solutions for using custom true type fonts (ttf) on the iPhone, most notably Can I embed a custom font in an iPhone application? However,

Answer 1

Must you use an otf font on the device or can you convert it to ttf? It is relatively straightforward to convert an OTF font to a TTF font using a tool such as fontforge, perhaps that would be an easy solution.