Apple is thought to finally introduce iPhones with 120 hertz (Hz) refresh rates with the successors to the 12 series. However, only their highest-end variants are thought to get LTPO OLED displays, which, according to the latest word on this subject, are to be made by Samsung. However, LG might take over in this department in 2022.
https://www.notebookcheck.net/Samsung-secures-100-of-the-120Hz-LTPO-display-orders-for-the-iPhone-13-Pros.513944.0.html