Just attach your modem with your pc and type
and openwvdial-cand write your full information. for example:/etc/wvdial.conf
thank you[Dialer Defaults]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Modem Type = Analog Modem
Baud = 9600
New PPPD = yes
Modem = /dev/ttyUSB0
ISDN = 0
Phone = *99#
Password = vodaphone
Username = vodaphone


)

oops it's little bit outdated (just now I see the OP's date)
