Index: branches/version-2/data/class/SC_Customer.php
===================================================================
--- branches/version-2/data/class/SC_Customer.php	(revision 17731)
+++ branches/version-2/data/class/SC_Customer.php	(revision 17732)
@@ -101,5 +101,6 @@
         //docomo用にデータを取り出す。
 		if(SC_MobileUserAgent::getCarrier() == 'docomo'){
-			$_SESSION['mobile']['phone_id'] = SC_MobileUserAgent::getId();
+			if($_SESSION['mobile']['phone_id'] == "" && strlen($_SESSION['mobile']['phone_id']) == 0)
+				$_SESSION['mobile']['phone_id'] = SC_MobileUserAgent::getId();
 		}
 		if (!isset($_SESSION['mobile']['phone_id']) || $_SESSION['mobile']['phone_id'] === false) {