I’ve been using the T-Mobile 5g home internet for a while now. I was an early adopter and have been very happy with it. I was warned that it would be geo fenced, but I haven’t seen that happen. Just using it in Puget sound, not gonna work in Canada. Works at 8 knots here, but there are some areas with spotty coverage.
When my old one crapped out, I was able to get a replacement at a satellite store, but had to mail the old one back.
When dealing with T-Mobile retailers, it’s best to find one of the corporate stores. They can do everything. The rest are just independent retailers and have limited ability to do almost anything but sign new customers.