https://www.cnet.com/news/speedtest-calls-t-mobile-the-fastest-carrier-nationwide/

In what might be considered an upset, T-Mobile beat Verizon and AT&T in a nationwide speed score. The 2017 US Market report by Ookla used 14 million tests across 3 million devices to judge cellular speeds in the first half of the year. T-Mobile came in first overall.

Ookla used Speedtest intelligence for its report, and determined that overall cellular speed increased by 19 percent year-on-year in the US, but the country still dropped from 42nd to 44th in a global ranking of cellular speeds.