Many thanks to AR (www.linux.lk/~anuradha) for sharing the wvdial script during RMS' visit to sigiriya :)
To install wvdial (thought it comes preloaded with most distros)
# apt-get install wvdial
The /etc/wvdial.conf file for dialog GPRS/EDGE.
Modem = /dev/ttyACM0
Baud = 115200
Init = AT
Init2 = ATE0
Init3 = ATV1
Init4 = AT+CGDCONT=5,"IP","www.dialogsl.com"
Init5 = ATS0=0
Init6 = AT+CGQREQ=5,0,0,0,0,0
Init7 = AT+CGQMIN=5,0,0,0,0,0
Init8 = AT+CGATT?
Dial Command = ATDT
Phone = *99***5#
Username = 777123123 (Your mobile no.)
Password = 777807190test (this doesnt really matter)
Stupid Mode = yes
This worked with my w810i using the USB data cable on Ubuntu 7.10
Can't really boast of fast connectivity but its a life saver in emergencies :)