How to turn off the data on an iPhone 4 when I'm not in a Wi-Fi area?

I want to be able to get and give phone calls and text messages still, but I want to make sure I don't use up any other data when I'm in a no-Wi-Fi area. Like today, for example, I was still getting twitter and instagram notifications which uses up data right? I want to turn that off.

Turn off cellular in the settings, you can still make phone calls…

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