Can I use iPhone without data plan?

My friend offered me to sell an iPhone to me but I have at&t phone service and data plans are so expensive. And I don't want to buy any data plans. Can I use iPhone without having any data plans or the at&t will know hat I'm using iPhone and they will start charging me.
Please answer my question As soon as possible.

I know what you can use with a data plan.

Data is only for 3G usage and stuff. If you're not going to use the Internet without Wi-Fi then you should be fine.

They will automatically add a data plan onto your current plan.

I don't see what's the complaint about though, you can just get the lowest data plan ($15).

If that's expensive, you shouldn't really have a cell phone.

You have to have a data plan for all smartphones. There's no way around this. Even if you only use Wi-Fi you still have to purchase a data package.

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