This plugin can detect information such as country name, web browser and operating system from your commenters and then displays them on your comment section or anywhere you like.
Features:
<ul>
<li>
Detects and shows commenter?s country flag, web browser and operating system automatically
</li>
<li>
Supports many web browsers and operating systems: major desktop browsers, antiquated browsers, blogging software (for trackbacks and pingbacks), text based browsers, various PDAs and cell phones.
</li>
<li>
Uses a binay file for IP to country resolution and supports database sources from Webhosting.info – Software77.net
</li>
<li>
The returned string can be configed as a template to suite your theme
</li>
</ul>
<h3>Credits</h3>
Especially thanks to
<ul>
<li>
<a href="http://priyadi.net/" title="Priyadi Iman Nurcahyo" rel="nofollow ugc">Priyadi Iman Nurcahyo</a> for his <a href="http://priyadi.net/archives/2005/03/29/wordpress-browser-detection-plugin/" title="WordPress Browser Detection Plugin" rel="nofollow ugc">WordPress Browser Detection Plugin</a>
</li>
<li>
<a href="http://firestats.cc/" title="Omry Yadan" rel="nofollow ugc">Omry Yadan</a> for his <a href="http://firestats.cc/wiki/EasyIP2Country" title="Easy IP2Country" rel="nofollow ugc">Easy IP2Country </a> plugin
</li>
</ul>

Comment Info Detector

Enables you to detect your commenter's info and show their country flag, web browser, operating system automatically.

Phuc Pham

The library is from http://mobiledetect.net/. The BODY tag needs to use the body_class() function. The values: desktop, handheld, mobile, tablet, ios, android. See the screen shots for more.
Mobile_Detect.php version 2.8.20

Mobile Detect For CSS

The library is from http://mobiledetect.net/. The BODY tag needs to use the body_class() function. The values: desktop, handheld, mobile, tablet, ios, …

Comment Info Detector vs Mobile Detect For CSS