Why can't I listen to music on my iPhone?

I recently had problems with my iPhone and its not letting me play music through it or hear videos. It doesn't show the volume on the screen when I press the button on the left of the iPhone. I don't know what's wrong with it

Try restoring your iPhone through iTunes, cause what you are saying is generally a software problem, not hardware.restore and all will be normal.

I can't liste to my music on my phone from iTunes or download music either

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