I have a iPhone 4 and my apps aren't working?

So my data is on and my apps say they're on almost all of them but the only problem is they aren't working when I try to open them they say turn on cellular data can anybody help me thank you very much?

Turn on cellular data

Turn on your cellular data in settings. You probably turned if off to avoid hitting your data limit, and forgot to turn it back on for your new billing cycle.

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