For what it’s worth, OpenSignal’s April 2021 report says T-Mobile has the fastest 5G speed — the testing firm says T-Mobile has an average 5G download speed of 71.3 Mbps. While that may not seem as fast as what you’d expect from 5G, it’s ahead of the averages for AT&T (54.9 Mbps) and Verizon (47.7 Mbps).