They're pretty solid where I live. I have a second line with them and use it when I need fast speeds (like downloading my Apple Music Library or something). AT&T has the broadest coverage here though and great speeds, even on low-band 5G and on their LTE network. Verizon is a no-go -- they have broad coverage but terrible LTE speeds and no 5G available.Keep your expectations low with T-mo. I do!