[Q] Access Cell Modem topic

I have a galaxy s3 connected to centos 6. I want to access the cellular modem. I have installed the android development kit and rooted the samsung s3. I can get a root shell using 'adb shell'. I installed busybox for 'microcom' but I cant get the serial port to work.

root@android:/ # microcom -t 5000 -s 115200 /dev/ttyGS0
< just stalls till I type control-C>
root@android:/ #



root@android:/ # cat /proc/tty/drivers
/dev/tty /dev/tty 5 0 system:/dev/tty
/dev/console /dev/console 5 1 system:console
/dev/ptmx /dev/ptmx 5 2 system
/dev/vc/0 /dev/vc/0 4 0 system:vtmaster
rfcomm /dev/rfcomm 216 0-255 serial
g_serial /dev/ttyGS 238 0-3 serial
usbserial /dev/ttyUSB 188 0-253 serial
acm /dev/ttyACM 166 0-31 serial
msm_serial_hsl /dev/ttyHSL 244 0-2 serial
msm_serial_hs /dev/ttyHS 245 0-1 serial
pty_slave /dev/pts 136 0-1048575 pty:slave
pty_master /dev/ptm 128 0-1048575 pty:master
pty_slave /dev/ttyp 3 0-255 pty:slave
pty_master /dev/pty 2 0-255 pty:master
smd_tty_driver /dev/smd 252 0-36 serial
unknown /dev/tty 4 1-63 console

thanks,
Yile