Hi Steve, I think you are right - if I could have just slipped the old SIM into the Peplink, it would have just worked. But the olde micro SIM appears to be ceramic, so I don’t know if it would cut down properly. The new one from Verizon is plastic, and I’m sure it could be cut.
I talked to the T-Mobile rep, and they knew what it was, and knew it would need a “data only” plan & a new physical SIM - no Unlimited Plan for these devices 
But thats OK, at least I don’t have to play games.
I surveying the Internet, it is becoming clear that Verizon views an LTE Router as something for their “Home” product & plan line - and the thought of one of their “Home” devices moving around makes them crazy . “Just tell us the address where it will be located” My response: “Atlantic Ocean” =8^O .
Hartley