T-Mobile USA has become a master of flexible spectrum utilization, ever since it deployed 3G in unconventional bands in order to catch up with its rivals’ coverage. Since then, it has employed various 4G aggregations and refarming processes, and then rolled out 5G in 600 MHz spectrum to steal a march on those same rivals in 5G availability. It acquired Sprint largely to get its hands on a treasure trove of midband 2.5 GHz spectrum to improve 5G capacity and now says it has reached 3Gbps speeds by aggregating three 5G channels, while also leveraging its 5G Standalone (SA) architecture. The test applied 5G carrier aggregation (CA) to two channels in 2.5 GHz and one in 1.9 GHz…