I use SIM toolkit to user SIM register via HyperTerminal: Start->Programs->Accessories->Communications->HyperTerminal in winxp, I type command:

AT
OK
AT+STSF=1
ERROR
AT+STGI=0
ERROR
AT+STGR=99
ERROR
AT
OK

why I don't open sub menu and main menu of GSM and HyperTerminal don't ask security code ? I check my SIM STK on my Nokia phone when i user SIM register aks security code. can you help me ?