The majority of cell phone providers no longer offer unlimited data plans for the iPhone. The user must select a data plan that caps the amount of cellular data you can use in a billing cycle. Exceeding the limit of the data plan can get expensive.
When your iPhone is connected to a Wi-Fi network, any app that needs data from the Internet will use the Wi-Fi network instead of the cellular data network. The data usage is therefore not counted against your monthly cellular data limit. However, when not connected to a Wi-Fi network, any time an app needs data, it uses the cellular data network and is counted towards your monthly limit.
Starting in iOS 7, Apple provided features that allows you to see which apps are using the most data and to control which apps can use cellular data and which can not.
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