Spotted two Sprint site removal permits in Newton's permitting system:
One site is at 1172 Beacon St, Waban, MA 02468.
It's redundant as there is a T-Mobile site about 0.2 miles east of it.
Other site is at 47 Langley Rd, Newton Centre, MA 02459
Also a redundant site as T-Mobile has two sites nearby. One about 450ft to the north and another about 0.2 miles to the south.
Did some more exploring tonight. Saw n77 on both my USM and Visible SIMs, but never for long enough to take a screenshot, let alone do a speedtest. VZW's coverage maps are *massively* overstated for n77, at least here. Had to go pretty far north to even get those glimpses. Finding T-Mobile n41 was miles easier.
Just figured out this is a waste of time. US Mobile and Verizon lock the eSim to the emei while T-Mobile only uses it to see that you have a capable phone, like Red Pocket does with physical sims (although RP does keep track of what phone you are using it on with the emei.) So @Trip was right in this case on liking physical sims.