T-Mobile's main focus for 2018 was to be LTE-LAA, Mark McDiarmid, VP of network engineering told Monica Alleven at Fierce. In December, 2017, CTO Neville Ray promised they "will give customers even greater access to near gigabit speeds in 2018." They had just demonstrated speeds of 1.1 Gbps with Ericsson. (At end.) In February of 2018, T-Mobile proudly announced
Speeds of 1.3 Gbps were achieved by aggregating LTE carriers in licensed and unlicensed bands using five-component carrier aggregation, 256QAM, 4x4 MIMO and LAA on 14 antenna layers.