Save amount of Internet usage on iPhone?

I just got a text from my cell network saying I've used over 75% of my data plan for the month already. I don't know how this is possible because I don't even use it for Internet as much as I could… What can I do to cut back the usage?

Restarting frequently will close out of all apps that could be using background data. Also, if not in use, you can go into Settings > General > Cellular and shut your Cellular data off completely. This'll ensure no data is used.

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