Now that T-Mobile USA has Sprint, with its rich dowry of 2.5 GHz spectrum, in its clutches, it has wasted no time in deploying 5G in a three-tiered ‘layer cake’ stretched across the 600 MHz coverage band; Sprint’s 2.5 GHz, which has only been partially used for 4G; and millimeter wave spectrum. The first market to go live with all three variants was New York City, last month, and testing service Ookla said this “delivered an impressive user experience, and it was just an early taste of a 5G layer cake that could continue to improve”. Average download speeds had increased by 25% since January, to reach 98.96Mbps, with a peak of 541Mbps, said the mid-May report, because of the…