callforwarding: error popup with wrong status

Need to display error dialog when receiving not active status
after re-getting even though setting it to enable.

Bug: 146532586

Change-Id: I970e9cf495f0663811abf7331a05a6320be70d01
Signed-off-by: Jang Hayeong <[email protected]>
diff --git a/res/values/strings.xml b/res/values/strings.xml
index d75e484..a19f3df 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -273,6 +273,7 @@
     <string name="sum_cfnrc_disabled">Off</string>
     <!-- Error message displayed after failing to disable forwarding calls when the phone is unreachable -->
     <string name="disable_cfnrc_forbidden">Your carrier doesn\'t support disabling call forwarding when your phone is unreachable.</string>
+    <string name="registration_cf_forbidden">Your carrier doesn\'t support call forwarding.</string>
 
     <!-- Title of the progress dialog displayed while updating Call settings -->
     <string name="updating_title">Call settings</string>