How to know how much Internet i've used on my iPhone?

My parents are yelling at me saying I use to much Internet and I have to be careful to not pass what I'm suppose to use. How do you check how much you used? Or how much you have until you pass?

What type of phone do you have? I know for an iPhone you can go under settings and usage and it will tell you.

Adding Wi-Fi service your iPhone.

You can check your data/internet use under settings, general, usage, then cellular usage. But you have to reset it every month or its not accurate. The best way to find out is to log into your cellular service provider and check your current usage.

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