Data usage refers to the amount of data that your device uploads and downloads when it is connected to the wireless network. If you share your device with others, you can monitor the amount of data used by the device owner, guest, and any user profiles on the device. Only the device owner can change the data usage settings.
If you exceed the data limit of your plan, your service provider might charge you additional fees. For more information about your data limit, check your wireless service plan.