Maxaud

This plugin allows you to define different CSS rules that get loaded into the page’s for specific devices.
Includes checks for 18 different tablet options and 13 different phone options.
This can be useful if you need to target specific phones or tablets to make CSS changes or show certain advertisements for certain devices.
For more options or if you feel like donating, check out the <a href="http://codecanyon.net/item/mobile-css-pro/3182318/" title="Mobile CSS Pro" rel="nofollow ugc">PRO version of Mobile CSS</a> that is available for purchase.

Mobile CSS

Allows you to define different CSS styles that get loaded for specific mobile devices.

dixitalmedia

Jairo Ochoa

This plugin works with the open source <a title="Mobile Detect Library" href="http://mobiledetect.net" rel="nofollow ugc">Mobile Detect Library</a>. You can get further information on its website.
<pre><code>[ismobile device='iphone' debug=true ] Your content [/ismobile]
</code></pre>
<h4>Parameters</h4>
<ol>
<li>device: Filters the device where you want the content to be shown. It could be more than one device, simply separate them with comma.</li>
<li>debug: Shows Mobile Detect Library installed version. Also shows two arrays. The first one contains the devices which the library detects and the second one contains the devices where you want to show the content.</li>
</ol>
<h4>Values</h4>
<ul>
<li>android: Shows content in Android devices.</li>
<li>chrome: Shows content on Chrome browser (Only works on mobile devices).</li>
<li>desktop: Shows content on a computer. Opposite to mobile option.</li>
<li>ios: Shows content in iOS devices.</li>
<li>ipad: Shows content on a iPad.</li>
<li>iphone: Shows content on a iPhone.</li>
<li>mobile: Shows content on a mobile device (includes tablets and cell phones). Opposite to desktop option.</li>
<li>phone: Shows content on a cell phone.</li>
<li>safari: Shows content on Safari browser (Only works on mobile devices).</li>
<li>samsung: Shows content on Samsung devices.</li>
<li>tablet: Shows content on a tablet.</li>
</ul>

isMobile() Shortcode for WordPress

This plugin works with the open source Mobile Detect Library. You can get further information on its website.

Mobile CSS vs isMobile() Shortcode for WordPress