I'm not entirely sure what TrafficSense is if it isn't just a traffic counter per connection.
But don't forget that "always on" doesn't mean always in use. For instance, even people using social media will spend more time reading and composing than they will sending.
It's the old thing that anyone involved in communications systems design knows, that must of the time the connection is idle.
I expect they are working on the basis of knowing how their "unlimited" people use their connections. Even someone doing a lot of streaming isn't likely to be doing it 24/7/365.
They say there that in practice a terabyte of mobile data would suggest to them commercial use. No doubt they have ways of delving deeper into any connection reaching that. They point out that commercial use isn't allowed on the product.
I would put it at over 90% certainty they have it sussed so as not to fall foul of Ofcom. Or many disgruntled users.
The fact is they have been selling this product for at least three years now. We haven't seen single peep about it not being truly unlimited. The fact the previous one didn't have the infrastructure and backhaul in place isn't really relevant.
Look how quickly landline suppliers got unlimited sorted once they needed to.
I've just discovered on ISPreview that on 1 Nov they started rolling out Carrier Aggregation as well. 4G+ as they seem to call it. Sorry, I have to go but you'll fin it on the ISPreview News tab.
My broadband basic info/help site - www.robertos.me.uk.
Domains, site and mail hosting - Tsohost
Connection - Three 4G, tbb tests 35-45Mpbs down, 9-15 up.
If you never think of anything off the wall, you'll never think of anything original.