I purchased the 15 in hopes of avoiding the worst of "Apple Intelligence," to be made available for 16. The lack of a user manual is somewhat understandable; features are tied to the version of the OS, not the physical phone. But even Apple's OS 17/OS 18 documentation is incomplete and tedious to navigate. I imagine that there are a lot of "tips 'n tricks" to the iPhone that I am unaware. And I will never miss them, because Apple hides these features from me. Still, it works as a phone, a clock and a calendar, which is all I really need.