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Great phone, although I'm only giving it 4 stars because, its not too much different from the six, however shooting in 4k out of your pocket when you're not lugging your big SLR around, comes in handy.
I use my iPhone to record voice memos of melodies and sounds to remember. I also jot down all of my lyrics down into the notes app. I brainstorm and mind map in the app as well.