 18 pin Samsung cellphone special connector at the mobile phone (keypad 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).Pin
left-to-right
numbering
| Pin
right-to-left
numbering | Signal | Description |
| 18 | 1 | +VBATT (4.2V) | acc power |
| 17 | 2 | RS232_TXD | |
| 16 | 3 | RS232_RXD | |
| 15 | 4 | RS232_RTS | |
| 14 | 5 | RS232_CTS | |
| 13 | 6 | SCL | I2C Bus |
| 12 | 7 | SDA | I2C Bus |
| 11 | 8 | GND | Ground |
| 10 | 9 | MIC(+) | Microphone plus |
| 9 | 10 | MIC(-) | Microphone ground |
| 8 | 11 | GND | |
| 7 | 12 | VCC | internal power 3.6V |
| 6 | 13 | SIMPWDN_BOOT | SIMM Power Down Boot |
| 5 | 14 | +VBATT (4.2V) | |
| 4 | 15 | SPK(-) | Speaker plus |
| 3 | 16 | SPK(+) | Speaker ground |
| 2 | 17 | DCVOLT (CHG+) | charger input |
| 1 | 18 | DCVOLT (CHG+) | |
|  18 pin Samsung right-to-left numbering cellphone special connector at the cell phone (keypad up) |
