here is the email I got from Samsung About the hidden app option and mobile data icon
Thank you for contacting Samsung Telecommunications America.
We do understand your concern.
We should inform you that few enchantments of the features and options will take place after an update is performed on the phone. We apologize, it is not possible to retrieve the hidden applications on your phone as of now as it’s updated to Android 4.3 version.
However, we should also inform you that the data option is not included in the notification panel in this update. We will surely take this as a feedback from you. We apologize for the inconvenience this may have caused. Your concern is of the utmost importance to us.
Should you have more questions regarding your Samsung Mobile Phone, you can also reach out to our chat support team by accessing the following link. Live Chat is available 24 hours a day 7 days a week. Have a wonderful day!
Link:
Samsung
Thank you for your continued interest in Samsung products.
Sincerely,
Aaron
Technical Support