> Also a Fi user, and the quality of my internet is almost entirely based on whether the carrier is Sprint or not. Sprint, at least around here, almost always has no upstream bandwidth, so you can't even get a request to go out.
I had a Pixel 2 XL back in the old "Project Fi" days, I had to manually switch basically every time my phone selected Sprint as the carrier because it was so slow. After the rebrand and the expansion to allow other phones but only route them to T-Mobile, I switched phones, and I genuinely get better coverage. (This isn't too just due to the phone hardware, either; on my old phone, the data speed would be fine after manually switching from Sprint to T-Mobile, so the benefit seems to be that I don't actually ever get routed to Sprint anymore)
I had a Pixel 2 XL back in the old "Project Fi" days, I had to manually switch basically every time my phone selected Sprint as the carrier because it was so slow. After the rebrand and the expansion to allow other phones but only route them to T-Mobile, I switched phones, and I genuinely get better coverage. (This isn't too just due to the phone hardware, either; on my old phone, the data speed would be fine after manually switching from Sprint to T-Mobile, so the benefit seems to be that I don't actually ever get routed to Sprint anymore)