Here are the settings which worked for me.
Steps
===========
Edit your wvdial.conf file by entering following command
vi /etc/wvdial.conf
enter following settings
[Modem0]
Modem=/dev/ttyUSB0
Baud=115200
SetVolume=0
Dial Command=ATDT
init1=ATZ
init2=AT+CRM=1
FlowControl=Hardware(CRTSCTS)
[Dialer Reliance]
Username=
Password=
Stupid Mode=0
Inherits=Modem0
save it
2. Type following command on terminal
wvdial Reliance
you should get connected to internet
to close ctrl+c
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