Following is in my header:

<meta name="viewport" content="width=device-width, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no" />    

In my script i made this:

$(document).bind('mobileinit', function(){

        $.mobile.metaViewportContent = 'width=device-width, minimum-scale=1, maximum-scale=2, user-scalable=yes';

        $.extend($.mobile.zoom, {locked:false,enabled:true});

    });

But it isn´t work (on iOS it works) - any idea? :-S