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1. You can't.
2, the charging jack and the headphone jack are different, the structure inside is different, can not be used to plug the headphone.
3, the charging jack can be used to charge the mobile phone, is a conductive jack, headphones can not be inserted into the use.
4, the general mobile phone has a special headphone jack, you can look again, can not only a charging jack.
No, the OPPOA11 charging port can be used with a converter with a 3.5mm headphone port.