Will I be charged extra for using 3G?

I don't have a data plan.

On my iPhone, i've turned off the cellular data in the settings. But 3G was on and I didn't know. I did use internet these past few days in places with low Wi-Fi reception. I'm not sure if I ended up using the 3G or Wi-Fi. Is it even possible to use 3G if cellular data is turned off?

Suppose I did use 3G, will my phone company charge me extra, even though cellular data was off?
I'm really confused about this.

It depends on your data plan. My data plan is 200 mb. I keep my data off so i don't go over it. If your data plan is unlimted it doesn't really matter. If you go over your data plan you will be charged an extra $15 which happens to me alot. You won't be charged extra if you don't go over the limit and i'm charged $15 every month for a standard 200mb plan. It comes with every smartphone whether you want it or not.

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