Any device connected to the hotspot's Wi-Fi network will not realize that it's connected to a cellular data network.
It will behave as if it's connected to a Wi-Fi network (which it is), so any settings that usually restrict data access when connected to a cellular network will ignore.
To reduce excessive data usage, we suggest turning off push notifications for email and social apps, closing non-essential apps and browser windows, and powering off the hotspot when you don't need to use mobile data.
Additionally, when using a laptop, turn off any cloud backups, e.g. Dropbox, OneDrive, CrashPlan, which can use data in the background.
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