https://tongfamily.com/2017/02/26/well-these-r-confusing-results-t-mobile-is-first-in-opensignal-and-last-with-root-metrics-makes-some-sense-if-you-think-about-it-one-is-weighted-by-people-so-there-is-a-bias-where-most-people-are/
T-Mobile or Verizon with the best coverage