huawei gsm modem eg162g not show ttyS in /dev/ directory

view story

http://unix.stackexchange.com – I am new linux I created an application in java that connect the serial port of the gsm modem in Windows the serial ports name like COM3,COM7,COM15 but in linux redhat 6.0 I had to change name of the port to some thing like ttySx (X is number that came after S in /dev/ directory) but when I plug my gsm modem I to the linux it show me just (ttyUSB0-ttyUSB1-ttyUSB2) and there is no serial port for the device I tried it in Windows it work perfectly my gsm modem is (Huawei eg162g) (HowTos)