You are right, it does not scale. Tested on Nexus S with default browser.
Safari ( 960 , iPhone ). , minimum-scale. ( 2 3), :
<meta name="viewport" content="
user-scalable=yes;
width=device-width;
initial-scale=0.31; maximum-scale=1.0; minimum-scale=0.25"/>
, .
, - -. , !