Amazing speed

I subscribed to 5g home internet for the new house we are moving into. I tested the gateway at my old house. I got the expected, not wonderful 50Mbs bandwidth. I subscribed to have a backup connection at my new house (5g stays up during local power failures). When we got the key to the new house, I set up the gateway. I got 345 Mbs! That's way faster than my Xfinity connection.

I bought a D-Link multi-homing router.  It allows up to 3 WAN connections. I'm able to keep both connections active. T'he router has a built-in load balancer that will spread our use between the two connections. In the event one goes down, the router does an instant failover and works with the surviving service. We have a generator and UPS's on all equipment. We will be able to stay connected even when power and one of the services fail.

I don't understand why T-Mobile doesn't let me turn off the radios on the gateway. I'm only using the eithernet connection to get into our network.