Useful only for dialup networking? Some additional connections may be required in cable.
This is PCB113BBE cable scheme.
This phones may be connected to the USB port with simple cable, which connects D- and D- of USB port, D+ and D+ of USB port, +5V and Vcc of USB port, GND and GND of USB port (unconfirmed).
For phones with music player. (A920) 4 pin 2.5mm plug.