idle data usage by Samsung 4G LTE Network Extender 2

How can I estimate the internet data usage by my Samsung 4G LTE Network Extender 2 when it is idle (not carrying any cell phone calls)? Is there a background data usage level?

This device is at our 2nd home, and I get a reduced seasonal billing rate from my ISP for days where I don't go over 100MB. They claim I exceed that even for months no one is here, so I am trying to find a "data leak". The only data user I can think of is the network extender.

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