I've browsed around and can't seem to find an answer to what I think is a dumb question: I have an iPhone SE (original version) and a iPad mini 4 which currently have iOS 15.8.2. There are several apps I'd like to add, but in each case there's a notation that the app requires iOS 16. When I go to Settings and look at Software Updates, it says that the phone (or iPad) is up to date. So how do I get iOS 16? Am I missing something obvious, or is it not possible with my older SE?