My system is android ics. The following command works fine on my system. Libreference-ril.so - RIL library. TtyUSB2 is a node device created by drivers.
/system/bin/rild -l /system/lib/libreference-ril.so -- -d /dev/ttyUSB2
Rild is the ril daemon, and it is usually registered as a service in init.rc, as shown below.
service ril-daemon /system/bin/rild -l /system/lib/libreference-ril.so -- -d /dev/ttyUSB2
class main
socket rild stream 660 root radio
socket rild-debug stream 660 radio system
user root
group radio cache inet misc audio sdcard_rw log
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