Well something happen in ABQ this weekend. Noted some trouble data wise, but this morning at my house both my wife's iphone 8 plus and my XS Max were on Tmobile. On my run it was connected who time. I live in North Albuquerque Acres.
Went to work downtown and I noted it switched back to Band 41. Up at my house there is no band 41 (at least usable), so perhaps that is how they are bring on Sprint folks.