Detects if site is being viewed by a mobile browser and switches to a different theme of your choice.
Check you website with mobiReady. This will give you an answer
You can start your search at wordpress.org
Find yourselself a good mobile theme. Use it to work on a derivated child theme (never touch the original theme!)
I use the Opera Mobile Emulator. Start a new emulation and type "opera:config" into URL. That way you can change the Mobile user agent string to your gusto. Or take user agent switcher plugin for Firefox
Post a comment on MTS 2 - Mobile Theme Switcher 2
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Post it at the plugin page: MTS 2 - Mobile Theme Switcher 2