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How to check which apps are using the most data on an iPhone
Here are some easy instructions on how to check your iPhone’s data usage.
And if you’re using a limited plan and apps go over your data allowance while you’re away from Wi-Fi, it could start costing you money, especially if you’re abroad. Then, there’s the privacy aspect: dig into the data usage figures for your phone, and you might find that some apps are uploading and downloading a lot more than they really should given their functionality. Don’t forget there’s always airplane mode if you want to make absolutely sure that apps aren’t transferring any data over cell networks or Wi-Fi.
Or read this on The Verge
