Some time back,I tried putting in Tata USB modem (also known as plug2surf or Tata SXC 1080 here in India) on my Ubuntu desktop.
The configuration is pretty much straight forward that involves editing a wvdial.conf file with the supporting parameters for making the modem work.
Configuration steps:
1.From Ubuntu terminal,type sudo wvdial(Note that if you want to work as a root user itself,its better to first type “sudo -i”,this will put you in root mode directly).
2.Once wvdial is activated,you will need to edit the /etc/wvdial.conf file,open up using vim/gedit or any text editor and copy paste the following :
[Dialer Defaults]
Init1=ATZ
Init2=ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ISDN=0
Modem Type=USB Modem
Phone=#777
Password=internet
Username=internet
;New PPPD=yes
stupid mode=1
Modem=/dev/ttyACM0
Baud=460800
3.Save the contents,make sure they are in place(cat /etc/wvdial.conf should list them)
4.Run wvdial again and start surfing the internet.
Peace.