some androids can't handle meta viewport width=number.

androidViewport.js

/*
	There's <meta name="viewport" content="width=480" /> in html then...
*/

// handle Android's viewport
(function($, undefined){

	$.browser.android = /android/i.test(navigator.userAgent);

	if(!$.browser.android){
		return;
	}

	var timer;
	var $w = $(window);
	var $html = $('html');
	var $meta = $('meta[name=viewport]');
	function refresh(){
		if(timer){
			return;
		}
		$html.css('visibility','hidden');
		$meta.attr('content', 'width=device-width, heigh=device-height');
		timer = setTimeout(function(){
			var h = $w.height();
			$meta.attr('content', 'width=480, height=' + h);
			$html.css({
				visibility: 'visible',
				height: h
			});
			timer = null;
			// do something here if you need to refresh UI or something
			// $(':ui-iscroll').iscroll('refresh');
		},500);
	}
	$w.bind('orientationchange load', refresh);

})(jQuery);