Im currently working on a mobile version of a website, everything is great, works fine on an iPhone, Blackberry and Android.
I have one slight problem, not a big dea
A better solution can be using 100% instead of none, as stated by user612626 in an older thread: Font size rendering inconsistencies on an iPhone
body {
-webkit-text-size-adjust: 100%;
}
this way desktop webkit browsers can adjust size and zoom proportionally too. I think this is a better approach than filtering by screen size.
Hope it helps.