Notifications with data turned off
Why do I get notifications from apps when I have data turned off for them? Doesn’t it require data for the app to connect, update, and push notifications to me? Data is literally information, so with information transfer shut off, how is it transferring information? (I am NOT on WiFi, I am outside in the park getting notifications that such and such is trending, so and so posted this and that). My question is no how do I stop receiving notifications, I know how to turn them on and off, my question is am I really able to turn data off or will these apps use data anyway? My concern is because I pay for data by the GB, and want control of how and when I use it.
iPhone 6, iOS 12