Ookla reported that:

• 5G continues to expand (but without new 5G SA core network deployments), with T-Mobile leading on top-line performance, and the rest of the market playing catch-up. Fixed broadband speeds are also on the rise, driven by greater fiber deployment, and cable technology upgrades.
• T-Mobile continues to dominate the mobile landscape in the U.S., boasting the fastest speeds, best consistency, and top user ratings. T-Mobile was the fastest mobile provider in the U.S. during this period, based on Speedtest Intelligence® data for all technologies combined, with a Speed Score (which is NOT an actual speed) of 205.98. Its median download speed was 234.82 Mbps, a strong increase from 164.14 Mbps during the same period the previous year.
• Verizon Wireless and AT&T were runners up, with both driving increases in median download speeds.
• T-Mobile also led on median upload speed, with 13.30 Mbps, and on latency, with 48 ms.

• Connecticut topped the state rankings for fixed broadband download speeds, with a median almost 160 Mbps faster than last placed Alaska. Mobile was a similar story, with Illinois leading, some 120 Mbps faster than Alaska.
• Pittsburgh, Pennsylvania had the fastest median mobile download speed among the 100 most populous cities in the U.S. at 321.06 Mbps. Kansas City, Missouri was second; Raleigh, North Carolina was third; Indianapolis, Indiana fourth; and Nashville, Tennessee was fifth.
• Anchorage, Alaska had the slowest median mobile download speed at 58.63 Mbps. Reno, Nevada was second slowest; Honolulu, Hawaii third slowest; Orlando, Florida fourth slowest; and Toledo, Ohio was fifth slowest.
• T-Mobile was the fastest provider in 73 of the 100 most populous cities in the U.S.. Verizon Wireless was the fastest provider in Denver, Colorado; El Paso, Texas; Henderson, Nevada; Hialeah, Florida; Miami, Florida; and Newark, New Jersey. AT&T was fastest in San Francisco, California. Results were statistically too close to call in 20 cities.
• Verizon has started making inroads on performance, and recorded the best 5G Gaming Experience (who cares about that?). 
• AT&T Fiber led in speed and consistency, while Verizon was best for video and gaming experiences.

“With this report, there should now be no doubt that T-Mobile has reigned as the nation’s network champion for years,” said Ulf Ewaldsson, president of technology at T-Mobile. “As 5G solutions continue to evolve, we will be right there, driving the industry forward as we have done since launching the first nationwide 5G network in 2019.”

In a separate report last month, Ookla noted that T-Mobile in March gained access to additional 2.5-GHz spectrum it won at auction 108 in 2022. Similarly, AT&T and Verizon have both benefited from the recent early vacation of C-band spectrum by satellite providers. Furthermore, AT&T acquired additional 3.45-GHz licenses that it won at auction 110 in January 2022.

“Speedtest Intelligence data shows a clear correlation between the release of additional mid-band spectrum, 5G performance, and consumer sentiment for 5G networks, with all three national wireless providers benefiting over the past six months,” said report author Mark Giles, lead industry analyst at Ookla.  As a result, he expects 2024 “to drive renewed competitive pressure” between all US service providers.

References:

https://www.ookla.com/research/market-reports/united-states-speedtest-connectivity-report-h12024

https://www.telecoms.com/5g-6g/t-mobile-tops-another-speed-test-as-mid-band-spices-up-the-us