Just got the Pro1 today and somehow got it working on Verizon based on the instructions here.
Context: I have an existing account with Verizon. I've been swapping my sim to new devices for years. I've been carrying my sim from Droid Turbo, Turbo 2, Moto Z force, Moto Z2 force, Pixel 3 and now to the FXtec Pro1.
Steps I took:
Insert existing active sim from Pixel 3.
Skip initial setup step to setup network
Connect to wifi
Update to latest update
go to d