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4 pin 3.5mm (2.5mm) plug connector layout
4 pin 3.5mm (2.5mm) plug connector
at the end to cell phone
The first end goes to the cell phone(2.5mm), and on the other end is a jack for TRS headphones(3.5mm).

 

Device 1
Pin Number		 Device 1
Pin Name		 Device 2
Pin Number		 Device 2
Pin Name
1 Microphone 1 Left
2 Right 2 Right
3 Left(?) 3 Ground
4 Common/Ground(?) N/A  

When using the LG clip on an Xbox controller, the sound from the headset goes through only the right earphone, the second pin, and the Xbox headset connector is TRS, so it is confirmed that the first pin on the clip is for the microphone, but I cannot verify the ground pin for the headset.

3 pin stereo plug connector layout
3 pin stereo plug connector
at the Headphone Connector on it
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LG Microphone/Headphone Clip visual pinout:click to enlarge
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