How to check your data usage on an iPhone, and manage each app’s data

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If you have limited cellular data on your cell phone plan, there’s an easy way to check and manage your data usage on an iPhone.
With certain carriers, you’ll have to reset your "Current Period" of data usage to coincide with your phone’s monthly billing schedule. This will help ensure you don’t go over your monthly allotment and get hit with late fees.
You can also determine which iPhone apps use the most data and adjust your usage accordingly.
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The average person in the US uses 2 GB to 5 GB of cellular data each month, a number that increases with each passing year. Although some people are fortunate enough to have unlimited data on their cell phone plans, not all of us are so lucky.

If you have limited data each month, consider monitoring your usage to ensure you don’t go over your monthly allotment. After all, the last thing you need is an excessive late fee just because you read a few too many articles on Twitter.

Luckily, there’s an easy way to check your iPhone’s data usage so that you can stay within your monthly allowance. You can also check to see which apps use the most cellular data in case you’re watching your activity closely at the end of the month.

Note: The instructions following step three below will not apply exactly to all iPhones and carriers. Some carriers allow you to toggle between the data you’ve used in "This Billing Period" and "Last Billing Period," which will appear as separate tabs under the "Cellular" section of your settings.