How to not go over my data plan again?

So I guess I was too excited too have a iPhone 5s and didn't know I went over my data plan. So I have iPhone 5s with a 2gb AT&T contract plan. After this happened now I use Wi-Fi all the time but sometimes when I go out I want to use my internet.

Download the at&t app so you know exactly how much you have used. If getting close, turn off cellular data, if you don't know where its at just ask siri "go to cellular data"

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