When I tried the command wvdial in the terminal, I got the following:
[root@localhost ~]# wvdialconf /etc/wvdial.conf
Scanning your serial ports for a modem.
WvModem<*1>: Cannot get information for serial port.
ttyS0<*1>: ATQ0 V1 E1 -- failed with 2400 baud, next try: 9600 baud
ttyS0<*1>: ATQ0 V1 E1 -- failed with 9600 baud, next try: 115200 baud
ttyS0<*1>: ATQ0 V1 E1 -- and failed too at 115200, giving up.
ttyS1<Info>: No such device or address
Port Scan<*1>: S1
ttyS2<Info>: No such device or address
Port Scan<*1>: S2
ttyS3<Info>: No such device or address
Port Scan<*1>: S3
Sorry, no modem was detected! Is it in use by another program?
Did you configure it properly with setserial?
Please read the FAQ at http://open.nit.ca/wvdial/
If you still have problems, send mail to wvdial-list@lists.nit.ca.
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Please help me.........