I open http://widiastore.com/sample/jquery-mobile/ from my windows phone. The screenshoot of page is http://s16.postimg.org/iqztjqx1x/wp_ss_20130902_0001.png. Why the widget of the page is so small? If I open it from android and blackberry it's very nice user interface.
If you can change the HTML maybe you can add the viewport metadata: https://developer.mozilla.org/en/Mobile/Viewport_meta_tag
Insert this in between <head> and </head>
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0" />