Samsung Z320i pinouts
The connector/pinout information may be applied to the Samsung model Z320i

 Samsung D500 and others headset pinout should be compatible with Samsung B500, C160, C240, C250, D600, D720, D730, E300, E310, E340, E350, E360, E370, E530, E610, E620, E630, E720, E730, E760, E770, E800, E810, E820, E850, E860, E880, F880, i300, i320, i750, P207, P730, P900, S341i, S342i, S400i, S410i, X210, X540, X550, X650, X660, X670, X680, X700, X800, X810, Z105, Z107, Z130, Z140, Z220, Z300, Z310, Z320i, Z500, ZV10, ZV30 and ZV50.
Samsung D500 and others headset pinout should be compatible with Samsung B500, C160, C240, C250, D600, D720, D730, E300, E310, E340, E350, E360, E370, E530, E610, E620, E630, E720, E730, E760, E770, E800, E810, E820, E850, E860, E880, F880, i300, i320, i750, P207, P730, P900, S341i, S342i, S400i, S410i, X210, X540, X550, X650, X660, X670, X680, X700, X800, X810, Z105, Z107, Z130, Z140, Z220, Z300, Z310, Z320i, Z500, ZV10, ZV30 and ZV50. Samsung Z220, Z310, Z320i, ZX10, ZX20, ZV40, ZV50 cell phones USB pinout original cable named PCB120.
Samsung Z220, Z310, Z320i, ZX10, ZX20, ZV40, ZV50 cell phones USB pinout original cable named PCB120.