Verizon's early rollout of millimeter-wave 5G is producing high speeds and throughput, but the high-frequency spectrum isn't suitable for widespread coverage, Verizon CEO Hans Vestberg said today. One day after T-Mobile CTO Neville Ray wrote that millimeter-wave spectrum "will never materially scale beyond small pockets of 5G hotspots in dense urban environments," wireless industry analyst Craig Moffett asked Vestberg about Ray's statement during a Verizon earnings call.