[Q] Mobile Data Icon Missing

[mdawdy]

My SGH-i257M Rogers Canada is not set up to have the Mobile data ON/OFF icon available on the notification screen. When i select to edit the Quick Setting Buttons it is not in the set of choices. It was there until the phone was sent in for a repair last year; or perhaps after the KitKat 4.4.2 update?
I would like to get this back to the way it was. Any ideas?
TIA,

Mick​