Which carrier has the fastest 5G network?

T-Mobile 5G: What RootMetrics found RootMetrics ran its tests in the largest 125 cities in the U.S., and found that T-Mobile had the fastest 5G download speeds in 48 markets, compared to three for Verizon and zero for AT&T.

That has since changed and it now has two names for the new wireless technology: Ultra Capacity 5G is the name for its faster midband and millimeter-wave networks while Extended Range 5G is the name for its low-band network .