Index: wp-includes/functions.php
===================================================================
--- wp-includes/functions.php	(revision 21117)
+++ wp-includes/functions.php	(working copy)
@@ -3694,7 +3694,8 @@
 	if ( strpos($ua, 'iPhone') !== false
 		|| strpos($ua, 'iPad') !== false
 		|| strpos($ua, 'iPod') !== false ) {
-			return false;
+			return preg_match( '#(iPod|iPad|iPhone); U; CPU( iPhone)? OS ([\d_]+) like Mac OS X#', $ua, $version )
+				&& version_compare( $version[3], '6', '>=' );
 	} else {
 		return true;
 	}