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I disagree on iOS. Give an iPhone to someone never having used one before, and I'm sure they won't even be able to unlock it. I almost cringe when I see UX people with iPhones. Yes, it's esthetically pleasing, but please don't take too much inspiration from the way things work.
The first time somebody handed me an unlocked iPhone asking me to send a SMS (she was driving) I wasn't able to do it. I had to ask her where to touch. She was really surprised. I had a few years of experience on Android and 10+ with feature phones. On the other side, I asked another friend of mine to take a picture with my Android phone a couple of weeks ago and she (an iPhone user) wasn't able to find the camera ap…
I would assume that it’s similar on android, access the camera from lock screen or app. I’d probably try the iPhone style swipe the lock screen if I didn’t see a shutter or camera looking icon, otherwise I’d use search (if I could find that) to find the app.