cheak cable ....use data mode cable
here is pinout cheak
=== DATA MODE ===
keyboard top
1.........24
phone pin-3 connect to phone pin-4
10: Phone Rx (RJ-45 pin-2)
11: Phone Tx (RJ-45 pin-3)
24: Gnd
=== GPRS MODE ===
keyboard top
1.........24
12: Phone Tx (RJ-45 pin-3)
15: Phone Rx (RJ-45 pin-2)
24: Gnd |