How to turn off data automatically iphone 5?

I have a jail broken iphone 5 with AT&T. But since I have limited data, is there a way to set a limit to turn t off automatically after using a certain amount? I know that I can see how much I used and how much I have left and how to turn it off. But I don't want to accidentally go over the limit.

Well when i have reached my limit then i get a text saying its over, so when you get that text, just go and manually turn off the cellular network.

And if you don't get a message saying that you have finished you data, then you should just check your limit online

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