This is really a multi-part question.
When does data start being charged on the JetPack LTE HotSpot device? That is, does data start flowing and be charged as soon as I turn it on OR do I only get charged data when I have connected to the JetPack WiFi via one of my mobile phones and have actually accessed the Internet via the JetPack WiFi?
If I connect to the JetPack WiFi but am not on the Internet, is data still being used or charged to my account? I'm trying to figure out how to save data when traveling other than stopping at McDonalds or some other place every time I want to hop on WiFi. I'm often not near an open WiFi location. For example, traveling cross country or through the desert, et al. I am hoping I am presuming if I am connected to the JetPack WiFi that my phone is not also being charged for data usage.