I opened the usb data cable and seen a little board. I realized that the 4 wires then inside the cable are converted signals from rs232 serial communication from the phone's pinouts. After googling the usb data cable's parts, I've seen Vcc, D+, D- and Gnd. The gnd is connected to the gnd pin of the phone but the Vcc on the usb data cable is just used to get 5v from the usb port to run the little board on the cable which converts the RS232 TTL signals to USB signals.
Can you suggest how I can convert D+ and D- signals back to rs232 serial communication mode? Is it possible without losing data sent?