I have two older Dell Latitude laptops that have both been upgraded with SSID hard drives. However, one of them, my wife’s, doesn’t show the TMobile network on the list of networks. It only uses 5mghz. But, doesn’t show up on any of the three settings: Automatic, 5 or 2.4.
Looks like from a YouTube video that the older TMobile Gateway allowed you to make changes so it would work. But, the newer one only works through the phone app.