On your iPhone, launch the Settings app, and tap Cellular. Under Cellular Data, check the number next to Current Period. If you want to check when the current period for your iPhone data usage tracking began, scroll to the bottom of the screen. Under Cellular Usage Statistics, you can see Last Reset, which will list the date and time when the period began.
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For more in-depth information about what apps are consuming your data, you can browse the Apps by Usage section. The total consumption for the period will usually be displayed right below the app name or next to it. If you suspect that most of your data consumption is coming from your Personal Hotspot and you’re curious to know what devices gobble up the most data, tap Personal Hotspot. Then, you can review the device names or MAC addresses to see if any unfamiliar devices are listed.
Alternatively, you can also tap System Services, which will itemize how much data each feature has consumed. Some of the features listed here will include software updates, push notifications, and mapping services. Take note that if you’ve uninstalled apps, Apple will lump their data consumption within this period with other uninstalled apps, so you will not be able to attribute their consumption to them anymore.
