What is it that sometimes spins around in the center of the iPhone screen? –Why the iPhone can't be heard anymore?

Is the spinning wheel in the center of the iPhone screen a "spinning wheel" that spins in the center of the screen when nothing else is displayed? For veteran iPhone users in Japan, it looks like a rotating gear. Although it is a display effect reminiscent of a clock tower of quiz time shock, you can guess that something is being processed.


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