Auto switch to different tower when primary tower goes down.

I am pretty confident the T-Mobile gateway is not intended to be treated as a mobile phone. The name pretty much implies it is a static fixture, home internet gateway. The T-Mobile objective is to provide as predictable and reliable internet delivery with these routers and manage the user connections to specific towers to avoid congestion but it probably is about predictable delivery. They know the frequencies in service and the range of delivery for the radios on the towers. Geographical conditions vary so delivery of the service does vary from one user to another. My guess is in some cases they have provided these as possible solutions in some cases where 5G expansion is in the plans but is not completely there with the "intended" 5G rollout. They probably can and do switch the LTE and 5G tower connections from time to time on a case by case basis but it is not designed as an internet solution like the MIFI mobile hotspots. In our area the tower 5.3 miles out, line of sight, is pretty much my only solution. The only other T-Mobile tower I know of in this area is roughly 12-15 miles away and probably not ever a possible alternative due to the terrain here. I joined on the BETA program with the home internet solution in early January and it was very solid and reliable until the end of June. July was rocky with tower connection drops that were random and frequent. Now that they have upgraded the tower and seemingly addressed the issues the primary and secondary signals are solid and performance is improved. Keep in mind the home internet router only shares the characteristic of a mobile phone in that it uses the same frequencies and technology but is not a mobile device. If you take a little time to carefully rotate your router to slightly alter the antenna exposures to the LTE and 5G signals you might see an increase in signal strength. I took time to just rotate the router 15 to 20 degrees at a time and observe the strength of the connection. When I found a position, as I have now, where the 5G has stronger reception and the LTE holds a little less signal strength the LED screen on the top of the router consistently reports 4 bars and download and upload speeds are much improved. Using the web interface to see the operation for signal strength and quality of signal help to fine tune the links to the tower and provide a better overall experience. It takes time and patience but it is worth a little time to investigate the proper orientation of the router. Avoid external electric influences and screens that are metal. Good luck. Hope they get upgrades done on your tower so your solution improves as mine did. Be patient and talk to the T-Mobile support engineers. Some are great at listening and really try hard to help.