If I don't kill apps on my iPhone, will it use up my data?

I'm about to get an iPhone and I don't wanna get screwed into paying extra cuz I went over my data plan.

I have an iPhone and when I use Internet enabled/required apps, it doesn't seem like it takes up much data. That or it doesn't use any data. But here is what I think: I play a lot of games on my phone, and I never seem to run out of data. Just don't use YouTube or Safari too much and you'll be fine.

The internet app will use your data when it load pages so it will not use your data when it's in background or idle.

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