Pinout for chinese Nokia 6300 (MT 6227)

[pasalini]

Hi all.
I currently own a chinese phone that was passed off as a Nokia 6300; when I connect it to my PC it is recognised as a MT 6227.
One of the main problems with it it's the fact that it gets charged via USB with a tiny 12 pin connector on a single row (thus different from the one you list here).
Since I've lost this USB cable I don't know (of course) how to charge my mobile.
I was at a loss when I found another USB cable with apparently the same connector, but I soon realised it doesn't work.
The pinout connections surely must be different.
Does anyone know how the connections are done?

I've tried searching on many "pinout" websites, but I don't understand why everyone is talking about 3 wires (Rx-Tx-GND), when the USB sends out 4.

Can anybody help me, please?

Paolo