https://www.cnet.com/news/5g-will-rule-on-high-end-phones-by-years-end-ready-or-not/

"You're going to see that for the 5G markets, if most of the carriers are rolling out 5G in those markets, you're only going to have 5G flagships," Amon said in an interview last week at Mobile World Congress in Barcelona. 

That differs from the strategy of the first crop of 5G phones arriving early this year. Most companies are offering one version of their flagship phones that run on the faster network, as well as other variants that only tap into 4G LTE and older networks. Samsung's Galaxy S10 5G is basically its 4G LTE-enabled Galaxy 10 Plus on steroids. And Xiaomi's Mi Mix 3 5G is essentially the company's 4G LTE Mi Mix 3 phone with an added 5G chip.