IPhone 4s automatically using data

Okay, So I don't have any apps open i close all of them (double click home) and when i check my data usage it tells me i'm using more and more everyday. (The data goes upwards when it is doing nothing)
Is there a way I can stop my phone from using data whenever i'm not using it or when all the apps or closed? Than you.

Settings > General > Network > Cellular data OFF.

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