LTE Hat without a SIM

I have the LTE Hat on my Pi stack and there is NO USB com port in LSUSB for the hat. Does the hat stay “dormant” until a SIM is installed? I have not picked up a SIM yet.

I solved my own problem. Pressing the power button or toggling the GPIO powers it up and I see all the USB UART’s right away. Now I must wait for my SIM.