You will note that I mentioned both hardware and software components of the smartphone. If you have no idea where one starts and another ends, then all you see

You will note that I mentioned both hardware and software components of the smartphone. If you have no idea where one starts and another ends, then all you see is electrons running around in circles, both in a brain, and in a smartphone. Most mobile CPU designers would have a hard time debugging iOS apps, and most iOS devs would have a hard time debugging Apple A12 design. This, however, does not mean that fundamental principles which make a smartphone "smart" are hard to understand: concept of a stored program, high level programming language commands, user interface, etc. But these fundamental principles are buried behind massive design complexities which might not be directly related to the "intelligence" aspect of the phone (computer). I suspect (hope) this also applies to brains.