The User Agent Profile (UAProf) is used for capturing capability and preference information for wireless devices. This information can be used to detect various types of HTTP headers and other properties for visitor’s mobile device.

Apache provide some useful HTTP X Header information for WAP… which detect user-agent and other hardware/software information.

Mobile - Header Information on WAP

Source:

http://en.wikipedia.org/wiki/UAProf

http://code.google.com/p/mobiledevicedetector/

http://mobiforge.com/developing/blog/useful-x-headers

http://wapreview.com/?id=149

http://mobiforge.com/developing/story/device-detection-cloud-deviceatlas-personal

http://mobiforge.mobi/developing/story/mobile-sites-with-joomla-cms?dm_switcher=true

http://www.idelfuschini.it/it/apache-mobile-filter-v2x.html

http://www.dpinyc.com/literature/resources/code-bank/php-lightweight-device-detection/

http://logme.mobi/query/index.php