Have an iPhone getting charged $15?

Ok so I got an iPhone 4S in December and its working great. However, recently I get the text saying I'm using my monthly 1GB and I'm getting charged $15. Since I didn't have the cable on, I was using 4G. But now I'm using Wi-Fi and got the same message not too long ago. I've had Wi-Fi again yesterday. What is happening? Why am I being charged for Wi-Fi?

You have to turn off cellular network in settings, or else you will get charged every time you use the internet!

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