Monitor Data & Network Usage on a Mac
Use a free desktop based bandwidth monitor like SurplusMeter, it sits in your Mac menu bar and keeps an eye on data use for you. Use this in combination with watching data usage directly on the iOS device for best results, as there may be some discrepancies and it’s always better to err on the side of caution with Personal Hotspot to avoid an overage fee.
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Monitor Data Usage on iPhone or iPad
The first thing you’ll want to do is keep an eye on how much data you’re using. The easiest way to do this is directly on the iOS device that is sharing it’s internet connection through Personal Hotspot:
Open Settings and tap on “General”- tap on “Usage”-Scroll down and tap on “Cellular Usage”-“Cellular Network Data”-tap on “Reset Statistics”.