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As I type half of the sites I’m attempting to visit using the Tmobile 5G internet router do not work. There is a workaround to this issue. We had a similar issue with ATT almost a decade ago that blocked out access to viewing and downloading movies on our PS3. Old skool refers to the solution as running your modem in DMZ mode.

For household modems it simply means you run a hard cable out of the Tmobile 5G modem and into your old modem that worked before. The Tmobile 5G modem will pull the signal out of the sky except your old modem will broadcast it via Wifi instead of the troublesome Tmobile modem. 

We didn’t have an old modem, but I read that Apple Air / AirPort modems were friendly with this set up. I purchased the Apple Airport A1521 Airport extreme almost 10 years ago for $100. They last and they're tough. Look online and you can get them for $25-$40 preloved. You do not have to have an Apple phone or device to use it. After I ran the Tmobile 5G through the Apple modem DMZ style, all is fixed.