| Pin | Signal | Description |
| 1 and 2 | gnd | |
| 3 | tck | |
| 4 | tms | |
| 5 | tdi | |
| 6 | tdo | |
| 7 | Rx | |
| 8 | Tx | |
| 9,18 | Vbat | +4V? |
| 10 | rpwon | |
| 11 | rxd | |
| 12 | txd | |
| 13 | dsr | |
| 14 | rts | |
| 15 | cts | |
| 16,17 | dc in | Charger input, +5.2V |
Another variant of pinout (rx,tx only). Phone is keypad UP. Pins counted from left to right
| Pin | Signal | Description |
| 1 | GND | |
| 7 | Rx | |
| 8 | Tx |

