Cutting the cable. If it is available to your address (they have a tool on the web): I called up T-Mobile Home and gave them my info. They said they would send out my device ASAP (about 8 days). I got the device and unwrapped it. . .inserted the backup battery and closed it up and plugged it in. You have to be able to operate the enclosed Phillips Head screw-driver.
In about 10 minutes of charging the system, the system ´came up´ with all three lights green. . .I know, very complex dashboard

. Turned on my laptop, fired up my browser and typed in the login address: 192.168.1.1 . Logged in with the unique login found printed on the bottom of the device. Done and Dusted.
Acting as your own Administrator is slightly more challenging, but quite clearly outlined in the very slim manual. There is, of course, an Advanced Admin section which is more complex if you choose to dive into the weeds. . .
The Device is an Internet Gateway Router. My model says it will support up to 15 wifi devices. YMMV. It operates on two different Channels, 5 ghz. and 2.4 ghz, connecting to the internet through 4 G LTE cell phone connection. This is only important to the distance inside your home from your laptop and the Device. It also can provide internet connectivity through a 5 G LTE channel as well, but this is not universally available geographically yet. My smartphone likes this channel when I am home. . .seems quite fast. . .usually.
I have no connection to T-Mobile outside of being a customer. There is no metering of data usage. However, like
everyprovider, cable or cell, they occasionally have congestion issues. . .and occasionally employing what I call ´stealth throttling´.
Every month they debit me the $50. I am happy for now. . .probably until I´m not
Bob