Dear All, I trying your guidance, and install Modem (my modem is:"Smart Link smartpci563"). It seems Modem installed properly, I loaded Modem driver by: $sudo slmodemd -c USA /dev/modem SmartLink Soft Modem: version 2.9.9e-pre1 May 28 2006 17:44:44 Symbolic link `/dev/ttySL64' -> `/dev/pts/1' created. Modem `ttyS0' created. TTY is `/dev/pts/1' Use `/dev/ttySL64' as modem device, Ctrl+C for termination. ---------------------------------------- And In A new Terminal type This Command: hasan@edubuntu:~$ sudo wvdialconf Editing `/etc/wvdial.conf'. Scanning your serial ports for a modem. ttyS0<Info>: Device or resource busy Modem Port Scan<*1>: S0 ttyS1<*1>: ATQ0 V1 E1 -- failed with 2400 baud, next try: 9600 baud ttyS1<*1>: ATQ0 V1 E1 -- failed with 9600 baud, next try: 115200 baud ttyS1<*1>: ATQ0 V1 E1 -- and failed too at 115200, giving up. ttyS2<Info>: Device or resource busy Modem Port Scan<*1>: S2 ttyS3<*1>: ATQ0 V1 E1 -- failed with 2400 baud, next try: 9600 baud ttyS3<*1>: ATQ0 V1 E1 -- failed with 9600 baud, next try: 115200 baud ttyS3<*1>: ATQ0 V1 E1 -- and failed too at 115200, giving up. WvModem<*1>: Cannot get information for serial port. ttySL64<*1>: ATQ0 V1 E1 -- OK ttySL64<*1>: ATQ0 V1 E1 Z -- OK ttySL64<*1>: ATQ0 V1 E1 S0=0 -- OK ttySL64<*1>: ATQ0 V1 E1 S0=0 &C1 -- OK ttySL64<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 -- OK ttySL64<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 -- OK ttySL64<*1>: Modem Identifier: ATI -- SmartLink Soft Modem ttySL64<*1>: Speed 4800: AT -- OK ttySL64<*1>: Speed 9600: AT -- OK ttySL64<*1>: Speed 19200: AT -- OK ttySL64<*1>: Speed 38400: AT -- OK ttySL64<*1>: Speed 57600: AT -- OK ttySL64<*1>: Speed 115200: AT -- OK ttySL64<*1>: Speed 230400: AT -- OK ttySL64<*1>: Speed 460800: AT -- OK ttySL64<*1>: Max speed is 460800; that should be safe. ttySL64<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 -- OK Found a modem on /dev/ttySL64. Modem configuration written to /etc/wvdial.conf. ttySL64<Info>: Speed 460800; init "ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0" hasan@edubuntu:~$ wvdial --> WvDial: Internet dialer version 1.56 --> Cannot get information for serial port. --> Initializing modem. --> Sending: ATZ ATZ OK --> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 OK --> Modem initialized. --> Configuration does not specify a valid phone number. --> Configuration does not specify a valid login name. --> Configuration does not specify a valid password. hasan@edubuntu:~$ ---------------------------------------------------- Hooray, It Seems: Found a modem on /dev/ttySL64. And i configuring the /etc/wvdial.conf file Inserted username, password, and telephone number for dialup connection. After this setting into terminal type this command: hasan@edubuntu:~$ sudo wvdial --> WvDial: Internet dialer version 1.56 --> Cannot get information for serial port. --> Initializing modem. --> Sending: ATZ ATZ OK --> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 OK --> Modem initialized. --> Sending: ATDT9712020 --> Waiting for carrier. ATDT9712020 NO CARRIER ERROR --> No Carrier! trying again. --> Sending: ATDT9712020 --> Waiting for carrier. ATDT9712020 NO CARRIER ERROR -------------------------------- And editing /etc/wvdial.conf for again, Inserted a new line include "CARRIER CHECK = NO" OKEY, GOOD it's working and connected!!! But! It connected For 1 or 2 minute, and disconnected without any reason. Now when I wish connect to net, Get this result: hasan@edubuntu:~$ sudo wvdial --> WvDial: Internet dialer version 1.56 --> Cannot get information for serial port. --> Initializing modem. --> Sending: ATZ ATZ OK --> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 OK --> Modem initialized. --> Sending: ATDT9712020 --> Waiting for carrier. ATDT9712020 NO CARRIER ERROR --> No Carrier! Trying again. --> Sending: ATDT9712020 --> Waiting for carrier. ATDT9712020 NO CARRIER ERROR -------------------------- Have you any idea? Regards You Hasan