Where are you in the Northeast?
I frequent NH and Maine. TMo isn't even in the same league as Verizon or AT&T up there. Not even close.
I agree with you , just came back from Brenton Woods NH ski resort. T-mo had no service or USSC Edge on 93 highway and around the area, 0 coverage at the resort, just USSC E on the top. Thanks God I had Att hotspot in my car. I travel more abroad 10:1 ratio, that's why Tmobile is better for me , overwise I cannot recommend it to anybody without a try before.
Same story in Poconos area. Att is not the best there, but T-mobile is even worse..