Ming-Chi Kuo, one of the most reliable Apple analysts, expects Apple to release a trio of iPhones in 2020, including models with 5G connectivity.

Two of the flagship models will have 5.4 inches, 6.7-inches OLED displays, and a third lower end model will have an OLED display of 6.1-inches, Kuo wrote
in a research note for TF International Securities. He says Apple’s 5.4-inches and 6.7-inches iPhones will be 5G enabled whereas the 6.1-inch variant will support up to LTE.

The screen sizes suggested by Kuo indicate that Apple is planning to shrink the size of its successor to the current iPhone XS to cater to people who want smaller screens. The 6.7-inches variant, which is presumably the successor of iPhone XS Max, is touted to come with a bigger screen as compared to the current size of 6.5-inch. Apple will not change the screen size of iPhone XR successor as per Kuo’s report.

Apple is expected to use Qualcomm 5G modems for the 5G-enabled iPhones. Broadcom, which is already an Apple supplier, will provide RF power amplifiers.

Starting from 2021, all the iPhones will support 5G and Kuo also believes that by 2022 to 2023, Apple will get its own 5G modem something on which the company is working for quite some time now.

Apple opted-ot or couldn't offer a 5G iPhone in 2019, as many competitors have done. The company was initially believed that the 5G market / coverage was still imature for a 5G device, but obviously the late legal settlement with Qualcomm combined with Intel's previous inability to supply 5G modems to Apple have played an important role to Apple's overall stance on 5G.