You have used 20% that's why.
Only you know what you are doing, or you can check your phones data app to establish what is using data.
Thank you for becoming part of community 🙂
I can see @Northerner has offered support with this and I'd also recommend taking a look at our How much Internet data are you using on EE? support article for some guidance.
One of these options may help you find the answers you need.
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