no home internet service all day

"Unhappy Home Internet", the people at T-Mobile don't monitor this forum, so if you're having problems, which it certainly sounds like, you can only call Tech Support with your threat to cancel the service. Stating it on the forum will have no effect on T-Mobile trying to fix the problem.

To state the obvious, something has changed in your environment. Since you've tried a few different gateways, the problem is almost surely there is a change in the tower you were connecting to. Maybe it was relocated, maybe it's down for service, but I'd be willing to bet that's the problem.

T-Mobile supplies a type of Internet called Fixed Wireless Internet (FWI) which is brand new. Most providers use a wire of some sort to deliver the signal. T-Mobile and Verizon use FWI which is totally dependent on the gateway being able to identify and stay connected to a cell tower. Maybe, if it's available, Verizon FWI would be a better choice for you since you seem to be in one of those areas where T-Mobile just can't deliver the signal.

I can hear you're very frustrated, especially since your service was good for one year. Your only other option is to keep escalating your problem to a Supervisor, then to their supervisor… you get the idea. Maybe that will finally get you an answer.

It shouldn't be this hard.