The "device" may be a tablet or laptop.
The headline "AT&T to Launch Mobile 5G in 2018," led me to ask whether Intel or Qualcomm is moving their mobile phone chip delivery dates up yet another year. Most telco engineers were amazed when both companies moved delivery from 2020 to 2019; could they now move up to late 2018?
It's not impossible; TSMC will be in "risk production" of 7 nm, probably required for mmWave phones. Linley estimates the mmWave chips will require 10X the transistors of 4G, raising major questions of heat and power until 7 nm. There are thousands of engineers working furiously to get the chips out the door, but this would be remarkable.