diff --git a/common.php b/common.php
index c2525c5e4..b4cf0bac6 100644
--- a/common.php
+++ b/common.php
@@ -173,14 +173,16 @@ define('G4_HTTPS_BBS_URL',  https_url(G4_BBS_DIR, true));
 // G4_MOBILE_AGENT : config.php 에서 선언
 //------------------------------------------------------------------------------
 $is_mobile = false;
-if ($_REQUEST['device']=='pc')
-    $is_mobile = false;
-else if ($_REQUEST['device']=='mobile')
-    $is_mobile = true;
-else if (isset($_SESSION['ss_is_mobile'])) 
-    $is_mobile = $_SESSION['ss_is_mobile'];
-else if (is_mobile())
-    $is_mobile = true;
+if (G4_USE_MOBILE) {
+    if ($_REQUEST['device']=='pc')
+        $is_mobile = false;
+    else if ($_REQUEST['device']=='mobile')
+        $is_mobile = true;
+    else if (isset($_SESSION['ss_is_mobile'])) 
+        $is_mobile = $_SESSION['ss_is_mobile'];
+    else if (is_mobile())
+        $is_mobile = true;
+}
 
 $_SESSION['ss_is_mobile'] = $is_mobile;
 define('G4_IS_MOBILE', $is_mobile);