In the first 15 days of August, Huawei sold in China 1 million Mate 20 5Gs for US$900. ZTE is also selling 5G in China, with 6 more phones soon to hit the market. Oppo has announced a 5G price of US$580 for what looks like an excellent phone.

Sales have been growing month to month in Korea, now past 2 million. KT has estimated 10% of Koreans (about 5 million) will buy a 5G phone in 2019 and 30% by the end of 2020. I doubt China will go quite that fast, but the number will certainly be large.

There's every reason to expect the Chinese subscription figure to grow rapidly. The current plans are 100,000 to 200,000 radios in 2019, which will cover important parts of major cities. Beijing is mostly covered inside the 5th Ring Road already. 600,000-800,000 radios in 2020 will cover at least 50% of the population and possibly 75%.   

I'm calling the December 2019 and December 2020 figures "guesses," not estimates. They could be low.