NEC P3 cell phones

full pinout

+----------------------+
|   1  2  3  4  5  6  |
|   o  o  o  o  o  o  |
| O              |
|   o  o  o  o  o  o  |
|   7  8  9  10 11 12 |
+----------------------+

Pin	Description
1	Audio out (EAR)
2	Audio out (EAR/SPEAKER)
3	Audio out (SPEAKER)
4	SDATA (Serial Data)
5	No Connect
6	VCC (+8V)
7	No Connect
8	Audio in (MIC)
9	GND
10	BUSY
11	SCLK (Serial Clock)
12	GND

Source:www.pinouts.ru