As far as I can see, the T3 Framework is detecting mobile browsers, and based on that is submitting respective layout.
This is the list of “mobile devices”: ‘iphone’,’android’,’opera’,’blackberry’,’palm’,’windows’ (but actually, those are browsers installed on them).
There are 2 layouts for handheld devises available:
“iphone”, and
“handheld” (for all other mobile browsers)
But both layouts display only the main content block
<blocks name=”middle”>
<block name=”content-mass-top” style=”raw”>ja-news-mobile</block>
</blocks>
The difference is that layout for iphone is loading its own CSS and supporting JS script.
What exactly you don’t like (and what’s the difference) in handheld view?