How do you check data usage for Verizon VTech / MiFi?

My dad bought the Vtech (that's what he said - it's not MiFi but similar), and I can't figure out how to check the usage... I added it to the VZ Access Manager, but when I click Usage it says device not available? ...I was going to register on My Verizon so I could check usage on there, but I don't have a Verizon cell phone number to register with.

TIA!
 
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