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by codfrantic 3452 days ago
To make things even more complicated, I have a Sony Xperia Z2 which uses a 5 point jack plug TRRRS, as far as I know the extra connection is only used to receive microphone signal from the included noise cancelling headphones.[1] (Since the noise cancelling logic is handled on the phone).

[1] https://www.sonymobile.com/global-en/products/accessories/di...