My ZTE Mobile Hotspot turned itself on at home where we have 100gb fibre, no reason to use the ZTE at home.The hotspot took over the connection to my iPad and allowed an update and more to take place. I was at the max of my data when I shut it off after work earlier in the day. A gigabite was used before I saw the unit had turned itself on. I got a $10 charge. It could have been more had I not noticed it. I might have started to watch videos etc and I would have had even a larger charge.
The charge would be valid because data was used, I think you should investigate why the hotspot turned on by itself to prevent this from happening again.
