It may be that the earphone plug is oxidized. Use an eraser to wipe off the outer oxide layer, and then insert it. If it doesn't work, the components in the earphone are broken and sent to be repaired. Check whether it is the problem of the mobile phone, and carry out the following processing: 1. Check whether the music player and mobile phone volume are adjusted properly. 2. The mobile phone jack has oxidized. Wipe it with absolute alcohol dipped in a cotton swab, and then try inserting it. 3. The mobile phone is too stuck, resulting in slow response. Clean up the garbage of the mobile phone, delete unnecessary things, shut down and restart. 4...
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