How to control data overage on iphone?

My son has an iPhone and always goes over the monthly data limit. Is there a way that either I can control when it can use data or a way that it will shut off data when it gets to the limit?

I'm not sure if you can *completely* control the data usage, but there's an option on the phone to turn off "cellular data", so it'll only have internet access and whatnot when you're in Wi-Fi-range.

If not, might I suggest a downgrade? If your son isn't respectful enough to be responsible with his data usage, how is he deserving of an iPhone? I'm not trying to be rude, I'm just offering my two cents--data is a hefty bill.

Well, go to straight talk/ You get UNLIMITED everything for 45 dollars a month.
Problem solved. Go to a down grade.

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