How to get my iPhone to stop using data without me knowing?

Even when I'm at home and connected to Wi-Fi, I still somehow managed to use 25MB of data. How is that possible? What's using data even though I'm connected to Wi-Fi?

There are apps that are constantly updating in order to provide new information. That's what's eating up your data. Facebook, weather, email, etc. You get my idea. Turn off your mobile data when you're not using it. That's how you stop the data from being used. Hope this helped.

Turn off cellular and 3/4G and close all apps that are using Internet when you're not near Wi-Fi.

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