Prototyping on a 3600...

I can't seem to find the means to control font size via CSS. I've reached a point where I believe it's because I am not specifying a font size that exists on the phone, or not specifying it directly.

Is there anyplace where the default font styles and sizes are listed for phones?

Should i be specifying in "px" or "pt"? Something else?

The one thing troubling me that my diagnosis may not be right is that even styles like this don't render a different font size:

h2 {
font-size: large;
}

Am I missing something fundamental?