It's hard for me to figure anything out on the iPhone. Nothing seems obvious or discoverable beyond the basic "tap an app tile to open it." Some of that is just differences from Android but the various gestures and the way settings are scattered all over the place just seems almost arbitrary. Maybe there is a rhyme and reason but I feel that if I wanted to learn that I'd need to sit down through a tutorial.
I once worked with a product manager who said "if users need training, you've failed" this was in the context of a consumer-oriented website but it seems to be a lesson lost on Apple.