Verizon has already committed to launching 5G in Sacramento in 2018, but what about the other cities it promised? They're finally starting to trickle out. Company chief Lowell McAdam has confirmed that the high-speed network will launch in Los Angeles sometime in the fourth quarter of the year. As before, the initial focus will be on fixed internet access. You'll need to wait until the first quarter before you can carry a 5G-capable mobile device, McAdam said in a chat with CNBC.