1)Through ppp Script

# /usr/sbin/pppd /dev/ttyUSB0 115200 crtscts nodetach defaultroute lcp-echo-failure 10 lcp-echo-interval 86400 connect '/usr/sbin/chat -t 6 -s -v "" ATZ OK ATDT*99***1# CONNECT \d\c'

add line in /etc/resolv.conf
nameserver 202.56.240.5
nameserver 202.56.230.5
nameserver 202.56.231.117


2)Through wvdial

# wvdialconf /etc/wvdial.conf
# vi /etc/wvdial.conf

[Dialer Defaults]
Modem = /dev/ttyUSB0
Baud = 115200
Dial Command= ATDT
Init1 = ATZ
#Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ISDN = 0
Modem Type = Analog Modem
Phone = *99***1#
Username = 9934189361
Password = gprs
Stupid Mode=1

and add nameserver entry in /etc/resolv.conf
nameserver 202.56.240.5
nameserver 202.56.230.5
nameserver 202.56.231.117

then
# wvdial

from Samir Kar
MostlyLinux
jamshedpur