A Snapdragon X20 LTE modem mobile test device, supporting downlink LTE Category 18 for theoretical peak download speeds up to 1.2 Gbit/s

12 independent streams of LTE data

4x4 MIMO, 256 QAM and three-carrier aggregation across 60MHz of downlink spectrum on T-Mobile's network

So how relevant is this to an actual user? Well, Qualcomm has previously said that a user with a compatible device will get between 100 Mbit/s and 300 Mbit/s on a real-world network. (See When Is a Gig Not a Gig? When It's Gigabit LTE!)

The whole push towards faster speeds and lower latencies on mobile 4G networks, however, could give some users pause about a switch-over to 5G as that arrives in 2018 and 2019. Especially as much of the early hype around 5G is concerned with fixed services, particularly in the US.

— Dan Jones, Mobile Editor, Light Reading