full pinout. should also work with V205, D418, E608, E715, EYX, P408, S307, S308, V206, X308, X426, X427 18 pin Samsung cellphone special connector  at the cellular phone (keyboard up) There are two numbering schemes - with pins counted from left to right and with pins counted from right to left (phone is keypad up).
Pins other than Tx,Rx,Vext,Gnd may be vary in different models.

Pin
left-to-right
numbering

Pin
right-to-left
numbering Signal Description1,218,17V_EXT_CHARGEcharge input316AUX_SPKhandsfree speaker out415TXD1serial 2 out for debugging purposes514+Vbataccumulator out6,8,118,11,13GND 712REC01power on/off scheme input910RXD1serial 2 in for debugging purposes109AUX_MIChandsfree mic in127CHARGER_OKpower on/off and charging control136JIG_RECpower on/off scheme control145CTSserial 1 CTS154RTSserial 1 RTS163RxDserial 1 in used for data/ flash cable (shorted by R=22k to pin 18 in cable)172TxDserial 1 out used for data/ flash cable (shorted by R=22k to pin 18 in cable)181+Vbataccumulator out

Official cables are: SGH-E820, SGH-E100, SGH-E330, SGH-X100, SGH-X600, SGH-E700, SGH-E630 - PCB133NSEC/STD
SGH-X460 - PCB133LBEC/STD
SGH-S500 - PCB133LBE
SGH-E800 - PCB133LBEG/STD

18 pin Samsung right-to-left numbering cellphone special connector  at the cellular phone (keyboard up)

Source:www.pinouts.ru