Is my iPhone using data over my Wi-Fi?

Me and my mom just got iPhones and we've been under Wi-Fi the whole time but when we looked under data usage it said I used 300kb and she used 9.9 mb. Will be charged or is this a miscount?

Turn off Wi-Fi and on your settings get your network on your iphone. That easy and thats how you know if you are using it.

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