Thanks for the help I have got the modem working ussing open terminal " sudo slmodemd -c AUSTRALIA --alsa hw:0,6 " open second terminal " sudo wvdial --config wvdial.rc " [Dialer Defaults] Modem = /dev/ttySL0 Baud = 460800 Init1 = ATZ Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 ISDN = 0 Modem Type = Analog Modem Phone = Username = Password = Carrier check = no New PPPD = yes but when I try to conect using GNOME PPP the log said /home/eric/.wvdial.conf<Warn>: Ignoring malformed input line: ";Do NOT edit this file by hand!" WvDial<*1>: WvDial: Internet dialer version 1.56 WvDial<Err>: Cannot open /dev/ttySL0: Permission denied WvDial<Err>: Cannot open /dev/ttySL0: Permission denied WvDial<Err>: Cannot open /dev/ttySL0: Permission denied