Code96

This plugin easily detects mobile devices and redirects them to the mobile version of your site. This plugin also gives you the ability to bypass the mobile redirect based upon a cookie that is set on your mobile site. This allows you to redirect mobile users and give the option to “View Full Site.”
If you are upgrading you must enable the redirect via Settings > PHP Redirect
To set the cookie simply add the following PHP code to your mobile site:
setcookie(“mobile”,”m”, time()+3600, “/”);
The mobile redirect bypass cookie is optional, and should only be used to give your users a “View Full Site” option
Code 96 offers <a href="http://www.code96wd.com" rel="nofollow ugc">WordPress Design</a> services and custom <a href="http://www.code96wd.com/premium-wordpress-themes/" rel="nofollow ugc">WordPress Themes</a>.

PHP Mobile Redirect

Easily detect mobile devices and redirect them to the mobile version of your site.

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PHP Mobile Redirect vs mobile detection