Headphones have their own volume level. Sometimes when listening, trying to increase or decrease the volume with the buttons on the headphones, their internal level changes, and not on the phone. But on some phones, the headphone buttons as usual adjust the level of the phone - here it also depends on the phone model. If the sound is hard to hear, and the phone is set to the maximum - hold down the button on the right ear and the "internal" sound will increase.
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