Which smartphone and carrier are you using? (USA only)

For the past five or so years I've been using prepaid mvno carriers (in the us btw) and buying my own phone. It's somewhat of a frustrating experience trying to figure out which phones will actually work with which carrier. There's a lot of very attractivly priced phones from Chinese companies that unfortunately just don't support the u.s. LTE bands that i need. Im not really the kind of person who wants to buy a $600+ flagship and carrier offerings are generally abysmal and overpriced.
I also don't feel like I have very many options for carriers as I Live in a fairly rural area where t-mobile gets fairly spotty coverage. I have seen compelling options for Verizon if I wanted 4+ lines (it's only me and the wife right now, so that doesn't help us much) .
I'm definitely jealous of people in Europe and parts of Asia when it comes to cellphone and internet options.