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 right-to-left numbering | Pin left-to-right numbering | Description |
| 1 | 18 | +VBATT (4.2V) (accumalator voltage) |
| 2 | 17 | RS232_TXD |
| 3 | 16 | RS232_RXD |
| 4 | 15 | Debug_RX |
| 5 | 14 | Debug_TX |
| 6 | 13 | TA_Det |
| 7 | 12 | RS232_CTS |
| 8 | 11 | GND Ground |
| 9 | 10 | RS232_RTS |
| 10 | 9 | Data_Cable_Detection |
| 11 | 8 | GND Ground |
| 12 | 7 | Handsfree speaker (+) |
| 13 | 6 | Handsfree MIC (+) |
| 14 | 5 | VBATT (4.2V) |
| 15 | 4 | RS232_DTR |
| 16 | 3 | DA I_Reset |
| 17 | 2 | DCVOLT (CHG+) charger input |
| 18 | 1 | DCVOLT (CHG+) charger input |
Some sources points that pins 1,2,3,5 (left-to-right numbering here and later) should be shorted. Pins 8,11,14,15 should be shorted to GND. Supposed this to be neccessary for flash cable.
