Rick Merritt, one of the world’s best tech reporters, reports from Qualcomm Maui, “Data rates for the first batch of handsets will likely be limited to a few hundred Mbits/s.” The only test results were downloads of 140 megabits to 470 megabits. This is far less than the gigabit expected from millimetre wave.
A world-class engineer assures me the problems will be solved. Unless answers are found quickly, volume rollouts will slip into 2020. In addition, Qualcomm CEO Amon Cristiano confirmed they have no units for the most popular frequency bands, 600 MHz to 1.8 GHz, which require FDD. (Most spectrum from 2.3 GHz up is designated TDD, which is shipping.)
The first phones are slower than decent 4G and less than half what Verizon is delivering to homes. LTE is in the field delivering 500 megabits (T-Mobile, Manhattan and elsewhere,) For now, 80%+ of “5G” is slower than 4G. Really. The latest 4G lab results reach 1.5-2.0 gigabits. See http://wirelessone.news/10-r/1244-4g-verizon-telstra-2-gigabits Tens of thousands of towers are equipped with "Gig LTE," although there are very few phones.
"5G Hype Is Out of Control This Week" Sam Rutherford writes. "There was very little substance to be found.