Data usage refers to the amount of data your device uploads and downloads when connected to the wireless network in a given amount of time. If you share your device with others, the data usage info is broken down by the guest and user profiles that are set up on the device.
Data usage values are measured by your device. Your service provider might count data usage differently. If you go over your plan’s data usage limit, your service provider might charge you additional fees. Check your wireless service plan for information about your data limits.
Only the device owner can change settings to optimize data usage on your device. Data usage settings apply to all user profiles set up on the device.