Yes, 9 mobile phones can use Huawei headphones, because the Honor brand and the One Plus brand belong to the Android camp, so the compatibility between them is relatively strong, in other words, the Honor headset can be very suitable and smooth to use in the one Plus mobile phone, which is no doubt, because the Android camp has always been widely known for openness, unlike Apple.
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Yes, Huawei's wireline earphones can be used with OnePlus phones