Desktop to Mobile redirect htaccess code help

Hi, Just need a quick job. I want to redirect my site to a mobile version when browsed with a smartphone. It must be re-directed with a .htaccess redirect. I know there are many redirect codes I can find on the web for free, but I don't wanna go through them all to know which one will work good... so I've just come here to ask for the best one. Everything is setup on my site. I have the desktop version uploaded, and mobile version uploaded (in a different directory of course). All you need to do is add the .htaccess mobile redirect code so that anyone browsing from a smartphone will be automatically re-directed to the mobile version. I don't have access to an iPhone/Android, so I will be testing your solution using Opera Mini simulator ([login to view URL]). This is a very quick job for anyone who knows about this, so I'm not paying more than $5. I'll provide you the ftp login once I've selected you. Thanks.