WordPress at a glance
function is not described

wp_cache_mobile_group() WPSCache 1.0

No Hooks.

Return

Null. Nothing.

Usage

wp_cache_mobile_group( $user_agent );

Code of wp_cache_mobile_group() WPSCache 1.7.1

<?php
function wp_cache_mobile_group( $user_agent ) {
	global $wp_cache_mobile_groups;
	foreach( (array)$wp_cache_mobile_groups as $name => $group ) {
		foreach( (array)$group as $browser ) {
			$browser = trim( strtolower( $browser ) );
			if ( $browser != '' && strstr( $user_agent, $browser ) ) {
				return $browser;
			}
		}
	}
	return "mobile";
}