When I installed this version of Ubuntu, creating internet connection using the integrated UMTS/HSDPA modem was not directly supported, some third parties software was needed.
Searching the internet for a solution I reached the Vodafone Mobile Connect Card Driver application (I used vers. 2.0.beta3), I installed it on my system and launched it. At first it didn't work but after some attempts I discovered, by chance, that it needed root permission to work correctly.
When I ran Vodafone Mobile Connect Card Driver as root it discovered a "GT M378" GPRS/UMTS/HSDPA modem, asked for the PIN of my SIM, detected which was my provider (Vodafone IT) and asked me to accept some default values used in my country for this provider. I clicked on the "connect" button and everything started as expected.
As of this writing you can found the Vodafone Mobile Connect application here: https://forge.betavine.net/projects/vodafonemobilec
I also tried establishing a connection using wvdial but never had a 100% success: at the moment it only connects after I have run at least once Vodafone Mobile Connect Card Driver. I don't know how to send the PIN to the SIM using wvdial, this must be one of the reason I have to run Vodafone Mobile Connect Card Driver before wvdial to have it working.
I found lot of information and some good advice here:
I also have to give a demerit mark to Option support. Despite they are the modem manufacturer they refused to give me any support. They based this refusing on the fact that this is an OEM product and I had to ask for support to ASUS: next time I'll buy a notebook I'll make sure there is no Option OEM hardware in it.
Last time I used wvdial was with the following wvdial.conf file:
[Dialer Defaults]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Init3 = AT+CGDCONT=1,"","web.omnitel.it"
Modem Type = USB Modem
Baud = 460800
New PPPD = yes
Modem = /dev/ttyUSB0
ISDN = 0
Phone = *99***1#
Password = none
Username = none
Stupid Mode = on
(web.omnitel.it is my ISP's APN)
If you succeed in connecting to the internet using wvdial please let me know how you did it and the wvdial.conf file you used.