As of now, it is difficult to predict with certainty which older iPhones will be compatible with iOS 16. Apple typically announces the list of compatible devices when they release a new version of iOS. However, based on their previous patterns, it is likely that iPhones released in the last five years or so will be able to run iOS 16. This may include models such as iPhone SE (first and second generation), iPhone 6S and 6S Plus, and all subsequent models up to the latest iPhone 13 series. Nevertheless, it is always recommended to wait for Apple's official announcement to ascertain the compatibility of specific iPhone models with iOS 16.
This mind map was published on 5 July 2023 and has been viewed 124 times.